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• Cisco Crypto Key Generate Rsa Not Available 2017
• Cisco Crypto Key Generate Rsa Not Available List
• Crypto Key Generate Rsa Command

Cisco :: Deleting Whole Crypto ISAKMP Setup / Policy?

Cisco IOS Security Command Reference: Commands A to C, Cisco IOS XE Release 3SE (Catalyst 3850 Switches) 2 crypto key generate rsa. Crypto key generate rsa. Cisco IOS Security Command Reference: Commands A to C, Cisco IOS XE Release 3SE (Catalyst 3850 Switches) 8 crypto key generate rsa crypto key generate rsa. May 20, 2014 Author, teacher, and talk show host Robert McMillen shows you how to use the Cisco ASA version 9 generate RSA keys command.

Just looking at a new clients setup and they have a ISAKMP vpn to the old security company I am trying to remove..I am fairly new to cisco, I actually know how to setup the ISAKMP policies, acl's etc but never had to completely remove one before All I can find is Clear Commands which seem to just flush the config not actually delete any of the policy etc..Its not that urgent as all passwords are changed on the domain and the cisco, the usernames have been deleted as well.
#show crypto isakmp peers
Peer: ** Port: 500 Local: **
Phase1 id: **
#show crypto isakmp policy
Global IKE policy
[code]..

Cisco Switching/Routing :: Cat6500 - Crypto Key Generate RSA Command Missing

I recently rebuilt the configuration of our Cat6500 multilayer device for use as a user stack. The device is funtioning as it should be, but I am unable to set SSH using the 'crypto key generate rsa' command. The crytop command isn't avaiable at all, which suggests a firmware issue.
I have configured a hostname and Ip domain-name and the image is the only one available.
The show version output is listed below.
show verCisco Internetwork Operating System SoftwareIOS (tm) s72033_rp Software (s72033_rp-IPSERVICES_WAN-VM), Version 12.2(18)SXF12, RELEASE SOFTWARE (fc2)Technical Support: [URL] Copyright (c) 1986-2007
[Code]...

Cisco VPN :: 881 ISR Crypto Isakmp Not Available

I have to connect one of our it labors with some ec2 instances in amazon vpc. I downloaded a configuration file from amazon which starts with the command
crypto isakmp policy 200
My router tells me that he does not know crypto isakmp.
I searched on the internet and found that i have to install a specific license, but unfortunately i cannot find which license i have to install.
The show license command show following licenses
AdvIpServices active
AdvSecurity active
advsecurity_npe, ios-ips-update, waas_Express no state displayed
ssl_vpn active but eula not accepted
I found that i can accept the eula license with license boot module c880-data technology-package SSL_VPN command
But this command is also not available on my device. getting the crypto isakmp command working?

Cisco VPN :: 881 - Isakmp Crypto Module Not Available

I have a Cisco 881 ISR (CISCO881-SEC-K9) and have the advanced security license installed and enabled/active and in use (see screenshot). However, the isakmp crypto module is not available.
[code]..

Cisco VPN :: C2811 - (Show Crypto Isakmp / Ipsec Sa) Shows Nothing

I have setup ipsec VPN in my C2811 router but when 'show crypto isakmp/ipsec sa' shows nothing. Remote end point is an 'ASA5520'. Does it indicates that the remote ASA5520 not yet configured?
Code..

Cisco VPN :: 2811 / 2921 - Show Crypto Isakmp Sa Is Empty / No SAs Shown?

i repalced old cisco router 2811 with new one 2921 , all works except crypto map VPNs routers can ping each other , ACLs are not applied to outbound interfaces show crypto isakmp sa is empty after i make same configuration on a new router 2921 config crypto isakmp policy 10
hash md5
authentication pre-share
crypto isakmp key key address Y.Y.Y.Y no-xauth
[code]..
keys match , crypto isakmp policy is same , IOSs supoort VPN .interess traffic alse been initiated from both side and all worker in old cisco router with same configuration?

Cisco VPN :: VPN PIX 515E Which Isakmp Policy Are Applied

crypto map mapName 20 match address NAME_20_cryptomapcrypto map mapName 20 set peer IPADDRcrypto map mapName 20 set transform-set ESP-3DES-SHAcrypto map mapName interface IFNAMEcrypto isakmp identity addresscrypto isakmp enable IFNAMEcrypto isakmp policy 10authentication pre-shareencryption 3deshash md5group 2lifetime 86400crypto isakmp policy 30authentication pre-shareencryption 3deshash shagroup 2lifetime 86400crypto isakmp policy 50authentication pre-shareencryption aeshash shagroup 2lifetime 28800(code)
I need to be sure that when traffic matches access-list 'NAME_40_cryptomap' Isakmp policy 50 are used. And then traffic matches 'NAME_20_cryptomap' isakmp policy 10 are used. How do i link the crypto map with the specefic isakmp policy?

Cisco VPN :: ASA 5505 With 8.4 Image - ISAKMP Policy

I upgraded my Cisco asa from 7.2 to 8.4 system image. Now the old style syntax isakmp policy is not working anymore and I am not able to write a isakmp policy to being used for remote access VPN.
on many examples on Cisco site I have seen that it is always used Cisco any connect client installed on ASA. this means that the old configuration compatible with Cisco vpn client IPSEC is no more usable ? or what kind of syntax I have to use to configure remote access VPN ? for example these commands are not working anymore.
hostname(config)# isakmp policy 1 authentication pre-share
hostname(config)# isakmp policy 1 encryption 3des
[code]..

Cisco VPN :: Remove Default Isakmp Policy On Router (3845)?

My company recently failed a PCI scan because our router was returning 56bit des encryption for isakmp negotiation on an existing default isakmp policy. How do I remove this default isakmp policy. I am not running 12.4(15)T1 so the no crypto isakmp policy default does not work. Is there any way other than upgrading the IOS?
Is there any way to configure a maximum number of isakmp policies that an authenticating router will check? I have 2 configured higher priority ISAKMP policies. Maybe if there is a command to limit the number of isakmp policies the router checks, that would eliminate this default policy being matched?

Cisco VPN :: C2921 / Setting ASA-Router VPN No Crypto Command Options

I am trying to set up vpn tunnel between ASA and router C2921 for site-to-site routing. This was described on many sites. However I do not have required option under crypto command.
g1c1router1(config)#crypto ? key Long term key operations pki Public Key components
g1c1router1(config)#crypto
There are no crypto map etc options.
Some people suggested that I need crypto IOS. I have:
boot system flash:c2900-universalk9-mz.SPA.152-4.M3.bin
license udi pid CISCO2921/K9 sn FGL171910C1
Do I have to generate some keys? How do I do it? crypto key generate ?

Cisco WAN :: 1941 / Cannot Apply Service Policy On Multiple Serial Ports

I've run a across a strange issue that I've not encountered before and after the things I've tried am beginning to think it's a limitation of the router itself. What I have are 3 Cisco 1941 routers that are all endpoints for a customer's MPLS network. STL is the headquarters and both remote offices have a link back this router. Each of the remote locations only have 1 serial interface. It is a flat network with few routes and a small shoretel voip system running across it. Each router is running C1900 Software (C1900-UNIVERSALK9-M), Version 15.0(1)M5, RELEASE SOFTWARE (fc2).
QoS is configured as follows on each router:
class-map match-any AutoQoS-VoIP-Remark
match ip dscp ef
match ip dscp cs3
match ip dscp af31
class-map match-any AutoQoS-VoIP-Control-UnTrust
match access-group name AutoQoS-VoIP-Control
class-map match-any AutoQoS-VoIP-RTP-UnTrust
[code]..
If I try to apply the policy map to serial0/0/0, I get the following error:
% policy map utoQos-Policy-Untrust not configured
I've tried to create a different policy map with the same settings and get the same error. We thought that when it was first set up, each interface belonged to the same network, so we separated things out (hence the .252 mask). I'm not sure what else to try and I'm hoping its something painfully simple that I'm missing.

Cisco WAN :: Getting 1941 Tunnel Bandwidth Command?

I have a Cisco 1941 router with the Security license running IOS c1900-universalk9-mz.SPA.151-4.M.bin. 4k stogram license key generator. Is there a 'tunnel bandwidth' command like with routers that have the Advanced IP Services license? My concern is being able to adjust the bandwidth to a value greater than 8 Mbps..

Cisco WAN :: MLS QoS Map Command Missing On 2801

I am trying to run the following commands on a 2801 router, but the commands are missing:
mls qos
mls qos map cos-dscp 0 8 16 40 32 46 48 56
The only QoS command i have in global config is (no MLS qos) :
REMOTE-ROUTER1(config)#qos ?
restore-show-output Restore old show output
shape-timer Set the HQF shape timer interval
The router is running IOS:
System image file is 'flash:c2801-ipbasek9-mz.151-4.M5.bin'
Am i just running the incorrect IOS or am i missing somehting, i need to change the QoS Map for my Nortel VoIP. The VoIP phones connect to a 3750 PoE which used to conenct to a 2651XM to route VoIP and data traffic over the same copper pairs (WAN link to hub site) hence the need for a Service policy but being Nortel phones, require changing the cos-dscp map. the 2801 is going to replace the 2651XM using a new HWIC.

Cisco :: Missing IP Helper Address Command

I have a stack of 3750's running IOS 12.2(25). 'IP forward-protocal' command is configured, but the IP helper command is just not an option to put on an interface. Any have any idea of why that could be?

Cisco :: Missing Letters On Command Line

My 3550 is always 2 characters short on the command line. So my global configuration mode will look like this:Switch3550(config Say I wanted to enabled ftp, it would look like:Switch3550(config)# ftp enab.

Cisco :: 3560 - Missing IPv6 Tunnel Command?

I've finally got my 3560 switch IPv6 capable (IP Services IOS), but I've stumbled upon something strange: I can configure a tunnel interface, but I can't put the tunnel in ipv6ip mode. The command is missing. I can choose GRE, IP in IP, and a bunch of other things, but no ipv6ip. I'm a bit desperate here and probably I am going to have to live with it, but just in case? I need the IPv6 tunnel for an uplink to a tunnel broker which only supports this type of tunnel, and I'm surprised this is missing.

Cisco :: Missing Information On Sup 7L-E 10GE (show Command)

My customer has upgrade his 4506 from 6L-E to 7L-E 10GE.Ever since then if he run the command show dot1x interface gigabitEthernet x/x details some information are not been displayed (below are missing information)Is this intensional or do I need to kick this to TAC?

Cisco WAN :: ASR 1004 Bridge Group Command Missing

On the Cisco forums, an example is shown for how to configure BVI and bridge-groups on an ASR1004 but the same command (bridge-group) is not available under the interface on our ASR routers. We are running version of code: asr1000rp1-advipservicesk9.03.06.00.S.152-2.S.bin

Cisco Wireless :: Missing Configuration Command In CLI (1140 AP)

I am trying to chang IP configuraton for my Cisco 1140 AP, but in CLI I dont have a 'config' command (i used en before to enable administrative mode)
Bellow are the commands I can see:
AP7081.0506.d54a#?
Exec commands:
cd Change current directory
[Code]...

Cisco AAA/Identity/Nac :: ACS 5.2 Command Set Policy Not Working On Console?

I configure my Cisco ACS5.2 using Command set policy and providing Shell access 15.I allow user only “show * ” command.It works fine with Telnet. User Group cannot execute any command apart from “Show * ”But when I connect the device using Console user group has full permission on the devices.I believe Command set policy is not working on Console. Is it normal behavior or do I need to update some changes in ACS or Network devices ?
My network device configuration is as below :
tacacs-server host 10.x.x.x key test123
tacacs-server host 10.y.y.y key test123
tacacs-server timeout 1
aaa authentication login default group tacacs+ local
aaa authentication enable default group tacacs+ enable
aaa accounting exec default start-stop group tacacs+
aaa accounting commands 1 default start-stop group tacacs+
[code]...

Cisco Wireless :: Aironet 1231G - Missing Channel Command?

I have two Aironet 1231Gs, that are both running the same version of fimware: Version 12.3(8)JEE
From the gui, I try and change the channel on the main radio interface--It works from one, and I get just a blank page on the other. When I try and change it via the cli, I use the 'channel' command in conf int mode, and it works one the one, but the other one, the 'channel' command doesnt exist.

Cisco WAN :: WS-C3560G-48TS / The Command Track Number Rtr Is Missing

I have a switch WS-C3560G-48TS.The version of IOS is:
WS-C3560G-48TS 12.2(58)SE2 C3560-IPSERVICESK9-M
The command 'track number rtr' is missing. There are just three options there:
#track 10 ?
interface Select an interface to track
ip IP protocol
list Group objects in a list
Why is that so and where is rtr?I have the same switch with the following ios version:
WS-C3560G-24TS 12.2(50)SE1 C3560-IPSERVICESK9-M
rtr is present in there.

Cisco WAN :: 7609-S Service Policy Output Command Not Supported?

I am facing issue while configuring service-policy output command in Cisco 7609-S router with c7600s72033-adventerprisek9-mz.122-33.SRE2.bin IOS. However, in the same series router having IOS c7600s72033-adventerprisek9-mz.122-33.SRC6.bin is supported service-policy output.Both the switch have WS-SUP720-3BXL SUP.

Cisco AAA/Identity/Nac :: ACS 4.2 Command Sets Mapping To Access Policy

how to map my command shells that I created to the access policies under Default Device Admin/Authorization. All I get an option for is Shell Profile but not commands. See attached doc.ACS 4.2 was easy. I would just create a command set and apply to a group.

Cisco WAN :: Configure Policy-map With Police Command At Router 7606-S?

Im having problem configuring policies for limiting traffic on subinterfaces on cisco Router 7606-S. I have configured:
[code]..
So for egressQOS , i want to configure with police, not shape (for the memory reason).

Cisco VPN :: Missing Client Configuration Group Command - Old 2600 Router

I need to create a Cisco VPN Client connection: I am following the cisco vpn client link and I don't have the command crypto isakmep client configuration group XXXXX
[URL]
This is what I get: crypto isakmp client configuration ? address-pool Set network address for client
This is my show version, if there is an IOS that will work:
Cisco Internetwork Operating System Software
IOS (tm) C2600 Software (C2600-IK9S-M), Version 12.2(17a), RELEASE SOFTWARE (fc1)
Copyright (c) 1986-2003 by cisco Systems, Inc.
[Code]...

Cisco WAN :: Unable To Configure Service Policy Output Command In 2921 Router

I am not able to configure Service policy output command in Cisco 2921 router.While configuring I am getting below error.Same config is working fine in Cisco 3845 router.I am suspectting the problem with license in IOS.

Cisco Switching/Routing :: 1941 / Policy Based Routing With Two Default Routes

I have a 1941 router configured for Policy based routing with two ISPs.Two static default routes configured to point the gateways of respoective ISPs with same metric.But the problem is, packets are going throug the one ISP only while doing traceroute.
N/W connectivity:
ISP1-----> <----------------------> LAN1
Router
ISP-------> <----------------------> LAN 2
Below is my configuration :
Current configuration : 5958 bytes
!
! Last configuration change at 05:18:56 UTC Mon Jun 25 2012
!
version 15.0
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
[code]..

Cisco Switching/Routing :: Radius Server Command Missing From Global Configuration Mode 4510R

Cisco Crypto Key Generate Rsa Not Available 2017

I came across an interesting issue and thought I would see if anyone else has encountered it before contacting TAC.I have two Cisco Catalyst WS-4510R-E switches with a single Supervisor V module in each chassis. Both Sup cards are now running 12.2(54) SG1; ipbasek9 firmware; yes, I plan to move both switches to 15 code but that's another story. Anyways, prior to the upgrade the one switch was running 12.2 (33) code; I suspect the code was never upgraded; running ipbase non - K9 code. The other switch was running 12.2(44) with K9 prior to upgrade to 12.2(54).

Cisco Switching/Routing :: Radius Server Command Missing From Global Configuration Mode 4510R-E

I have two Cisco Catalyst WS-4510R-E switches with a single Supervisor V module in each chassis. Both Sup cards are now running 12.2(54) SG1; ipbasek9 firmware; yes, I plan to move both switches to 15 code but that's another story. Anyways, prior to the upgrade the one switch was running 12.2 (33) code; I suspect the code was never upgraded; running ipbase non - K9 code. The other switch was running 12.2(44) with K9 prior to upgrade to 12.2(54). With the background set, one switch reports the following:SwitchA (config)#r?radius-server redundancy regexp represourc rmon route-map router.

Cisco :: Encryption Method On ISAKMP

Cisco Crypto Key Generate Rsa Not Available List

Is 3DES on ISAKMP considered to be secured for your average site (other options are AES/DES)? I'd imagine AES should be much stronger but what about DES, is that considered adequate or broken? Is there any proof of concept attack against 3DES on ISAKMP (or ISAKMP in general)?

Cisco Routers :: RVS4000 - ISAKMP Nat

I'm currently dealing with a weird problem on a Cisco RVS4000. I'm trying to connect to a IPSEC VPN Gateway (NETASQ) located on the LAN side of the RVS4000. I'm using Green bow vpn client on the WAN side of the RVS4000. Basically I'm trying to get through the RVS.My VPN config is OK because i tested it on the LAN side of the RVS.
The RVS is configured like this: NO VPN configured.
Block WAN Request :OFF
FIREWALL,IPS,DDOS are OFF
NAT forwarding on for UDP 500 and 4500 directed from the wan to the ip of the VPN gateway. Seems right because iv managed to do this with other routers (different brands) on another site.I've wire sharked my vpn client and i keep getting ICMP destination unreachable (PORT UNREACHABLE) after my ISAKMP launching packet.Can the RVS nat these ports ?

Contents

Introduction

Secure Shell (SSH) is a protocol which provides a secure remote access connection to network devices. Communication between the client and server is encrypted in both SSH version 1 and SSH version 2. Implement SSH version 2 when possible because it uses a more enhanced security encryption algorithm.

This document discusses how to configure and debug SSH on Cisco routers or switches that run a version of Cisco IOS^® Software that supports SSH. This document contains more information on specific versions and software images.

Prerequisites

Requirements

The Cisco IOS image used must be a k9(crypto) image in order to support SSH. For example c3750e-universalk9-tar.122-35.SE5.tar is a k9 (crypto) image.

Components Used

The information in this document is based on Cisco IOS 3600 Software (C3640-IK9S-M), Release 12.2(2)T1.

SSH was introduced into these Cisco IOS platforms and images:

• SSH Version 1.0 (SSH v1) server was introduced in some Cisco IOS platforms and images that start in Cisco IOS Software Release 12.0.5.S.

• SSH client was introduced in some Cisco IOS platforms and images starting in Cisco IOS Software Release 12.1.3.T.

• SSH terminal-line access (also known as reverse-Telnet) was introduced in some Cisco IOS platforms and images starting in Cisco IOS Software Release 12.2.2.T.

• SSH Version 2.0 (SSH v2) support was introduced in some Cisco IOS platforms and images starting in Cisco IOS Software Release 12.1(19)E.

• Refer to How to Configure SSH on Catalyst Switches Running CatOS for more information on SSH support in the switches.

Refer to the Software Advisor (registered customers only) for a complete list of feature sets supported in different Cisco IOS Software releases and on different platforms.

The information presented in this document was created from devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If you are in a live network, make sure that you understand the potential impact of any command before you use it.

Conventions

Refer to Cisco Technical Tips Conventions for more information on document conventions.

SSH v1 vs. SSH v2

Use the Cisco Software Advisor (registered customers only) in order to help you find the version of code with appropriate support for either SSH v1 or SSH v2.

Network Diagram

Test Authentication

Authentication Test without SSH

First test the authentication without SSH to make sure that authentication works with the router Carter before you add SSH. Authentication can be with a local username and password or with an authentication, authorization, and accounting (AAA) server that runs TACACS+ or RADIUS. (Authentication through the line password is not possible with SSH.) This example shows local authentication, which lets you Telnet into the router with username 'cisco' and password 'cisco.'

Authentication Test with SSH

In order to test authentication with SSH, you have to add to the previous statements in order to enable SSH on Carter and test SSH from the PC and UNIX stations.

At this point, the show crypto key mypubkey rsa command must show the generated key. After you add the SSH configuration, test your ability to access the router from the PC and UNIX station. If this does not work, see the debug section of this document.

Optional Configuration Settings

Prevent Non-SSH Connections

If you want to prevent non-SSH connections, add the transport input ssh command under the lines to limit the router to SSH connections only. Straight (non-SSH) Telnets are refused.

Test to make sure that non-SSH users cannot Telnet to the router Carter.

Set Up an IOS Router or Switch as SSH Client

There are four steps required to enable SSH support on a Cisco IOS router:

1. Configure the hostname command.

2. Configure the DNS domain.

3. Generate the SSH key to be used.

4. Enable SSH transport support for the virtual type terminal (vtys).

If you want to have one device act as an SSH client to the other, you can add SSH to a second device called Reed. These devices are then in a client-server arrangement, where Carter acts as the server, and Reed acts as the client. The Cisco IOS SSH client configuration on Reed is the same as required for the SSH server configuration on Carter.

Issue this command to SSH from the Cisco IOS SSH client (Reed) to the Cisco IOS SSH server (Carter) in order to test this:

• SSH v1:

• SSH v2:

Setup an IOS Router as an SSH server that performs RSA based User Authentication

Complete these steps in order to configure the SSH server to perform RSA based authentication.

1. Specify the Host name.

2. Define a default domain name.

3. Generate RSA key pairs.

4. Configure SSH-RSA keys for user and server authentication.

5. Configure the SSH username.

6. Specify the RSA public key of the remote peer.

7. Specify the SSH key type and version. (optional)

8. Exit the current mode and return to privileged EXEC mode.

   Note: Refer to Secure Shell Version 2 Support for more information.

Add SSH Terminal-Line Access

If you need outbound SSH terminal-line authentication, you can configure and test SSH for outbound reverse Telnets through Carter, which acts as a comm server to Philly.

If Philly is attached to Carter's port 2, then you can configure SSH to Philly through Carter from Reed with the help of this command:

• SSH v1:

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• SSH v2:

You can use this command from Solaris:

Restrict SSH access to a subnet

You need to limit SSH connectivity to a specific subnetwork where all other SSH attempts from IPs outside the subnetwork should be dropped.

You can use these steps to accomplish the same:

1. Define an access-list that permits the traffic from that specific subnetwork.

2. Restrict access to the VTY line interface with an access-class.

This is an example configuration. In this example only SSH access to the 10.10.10.0 255.255.255.0 subnet is permitted, any other is denied access.

Note: The same procedure to lock down the SSH access is also applicable on switch platforms.

Configure the SSH Version

Configure SSH v1:

Configure SSH v2:

Configure SSH v1 and v2:

Note: You receive this error message when you use SSHv1:

Note: Cisco bug ID CSCsu51740 (registered customers only) is filed for this issue. Workaround is to configure SSHv2.

Variations on banner Command Output

The banner command output varies between the Telnet and different versions of SSH connections. This table illustrates how different banner command options work with various types of connections.

Unable to Display the Login Banner

SSH version 2 supports the login banner. The login banner is displayed if the SSH client sends the username when it initiates the SSH session with the Cisco router. For example, when the Secure Shell ssh client is used, the login banner is displayed. When the PuTTY ssh client is used, the login banner is not displayed. This is because Secure Shell sends the username by default and PuTTY does not send the username by default.

The Secure Shell client needs the username to initiate the connection to the SSH enabled device. The Connect button is not enabled if you do not enter the host name and username. This screenshot shows that the login banner is displayed when Secure Shell connects to the router. Then, the login banner password prompt displays.

The PuTTY client does not require the username to initiate the SSH connection to the router. This screenshot shows that the PuTTY client connects to the router and prompts for the username and password. It does not display the login banner.

This screen shot shows that the login banner is displayed when PuTTY is configured to send the username to the router.

debug and show Commands

Before you issue the debug commands described and illustrated here, refer to Important Information on Debug Commands. Certain show commands are supported by the Output Interpreter Tool (registered customers only) , which allows you to view an analysis of show command output.

• debug ip ssh—Displays debug messages for SSH.

• show ssh—Displays the status of SSH server connections.

• show ip ssh—Displays the version and configuration data for SSH.

  • Version 1 Connection and no Version 2

  • Version 2 Connection and no Version 1

  • Version 1 and Version 2 Connections

Sample Debug Output

Router Debug

Note: Some of this good debug output is wrapped to multiple lines because of spatial considerations.

Server Debug

Note: This output was captured on a Solaris machine.

What can go Wrong

These sections have sample debug output from several incorrect configurations.

SSH From an SSH Client Not Compiled with Data Encryption Standard (DES)

Solaris Debug

Router Debug

Bad Password

Router Debug

SSH Client Sends Unsupported (Blowfish) Cipher

Router Debug

Geting the '%SSH-3-PRIVATEKEY: Unable to retrieve RSA private key for' Error

If you receive this error message, it may be caused due to any change in the domain name or host name. In order to resolve this, try these workarounds.

• Zeroize the RSA keys and re-generate the keys.

• If the previous workaround does not work, try these steps:

  1. Zeroize all RSA keys.

  2. Reload the device.

  3. Create new labeled keys for SSH.

Cisco bug ID CSCsa83601 (registered customers only) has been filed to address this behaviour.

Troubleshooting Tips

• If your SSH configuration commands are rejected as illegal commands, you have not successfully generated a RSA key pair for your router. Make sure you have specified a host name and domain. Then use the crypto key generate rsa command to generate an RSA key pair and enable the SSH server.

• When you configure the RSA key pair, you might encounter these error messages:

  1. No hostname specified

     You must configure a host name for the router using the hostname global configuration command.

  2. No domain specified

     You must configure a host domain for the router using the ip domain-name global configuration command.

• The number of allowable SSH connections is limited to the maximum number of vtys configured for the router. Each SSH connection uses a vty resource.

• SSH uses either local security or the security protocol that is configured through AAA on your router for user authentication. When you configure AAA, you must ensure that the console is not running under AAA by applying a keyword in the global configuration mode to disable AAA on the console.

• No SSH server connections running.

  This output suggests that the SSH server is disabled or not enabled properly. If you have already configured SSH, it is recommended that you reconfigure the SSH server in the device. Complete these steps in order to reconfigure SSH server on the device.

  1. Delete the RSA key pair. After the RSA key pair is deleted, the SSH server is automatically disabled.

     Note: It is important to generate a key-pair with at least 768 as bit size when you enable SSH v2.

     Caution: This command cannot be undone after you save your configuration, and after RSA keys have been deleted, you cannot use certificates or the CA or participate in certificate exchanges with other IP Security (IPSec) peers unless you reconfigure CA interoperability by regenerating RSA keys, getting the CA's certificate, and requesting your own certificate again.Refer to crypto key zeroize rsa - Cisco IOS Security Command Reference, Release 12.3 for more information on this command.

  2. Reconfigure the hostname and domain name of the device.

  3. Generate an RSA key pair for your router, which automatically enables SSH.

     Refer to crypto key generate rsa - Cisco IOS Security Command Reference, Release 12.3 for more information on the usage of this command.

     Note: You can receive the SSH2 0: Unexpected mesg type received error message due to a packet received that is not understandable by the router. Increase the key length while you generate rsa keys for ssh in order to resolve this issue.

  4. Configure SSH server. In order to enable and configure a Cisco router/switch for SSH server, you can configure SSH parameters. If you do not configure SSH parameters, the default values are used.

     ip ssh {[timeout seconds] [authentication-retries integer]}

     Refer to ip ssh - Cisco IOS Security Command Reference, Release 12.3 for more information on the usage of this command.

Crypto Key Generate Rsa Command

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