Router1(config)#crypto key generate rsa general-keys modulus 1024. This crypto command generates a Rivest, Shamir, Adleman (RSA) key pair, which includes one public RSA key and one private RSA key. It's best to check the next generation encryption article from Cisco for this. Oct 26, 2014 If you are looking to reset the enable password for console access, it is known as Enable15 in ASDM. If you do not have privilege 15 access, another way is to power-cycle the ASA and press the escape key when prompted to do password recovery, but be forewarned, unless running config has first been saved, you will lose all changes since the last write Mem was issued. ASA(config)#crypto key generate rsa modulus modulussizeNote: The modulussize (in bits) can be 512, 768, 1024, or 2048. The larger the key modulus size you specify, the longer it takes to generate the RSA key pair. A value of 2048€is recommended. The command that is used in order to generate an RSA key pair is different for ASA software.
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KB ID 0001322
Problem
I’ve lost count of the number of times this has happened to me! Most of my colleagues prefer to use the ASDM for remote management, but if (like me) you work at command line, then sometimes people <ahem> forget to generate the RSA keypair when deploying a firewall. Then even if SSH access and AAA is setup correctly, you still can’t get in via SSH. Instead you see the following;
RoyalTS and RoyalTSX: ssh_exchange_identification: Connection closed by remote host.
PuTTY: PuTTY Fatal Error: Server unexpectedly closed network connection.
SecureCRT: Connection closed.
OSX/Linux: ssh_exchange_identification: Connection closed by remote host.
Now at command line you can fix this with a ‘Crypto Key Generate RSA Modulus 2048‘ command, but you can’t get to command line only ASDM.
Solution
Crypto Key Generate Rsa Modulus 1024 Asdm File
On older versions of the ASDM you could generate the keypair in the Identification Certificates section (well you still can but only if you are also generating a certificate request file). So, as we are command line warriors, lets use the ASDM’s command line!
Tools > Command Line Interface > Multiple Line
Crypto Key Generate Rsa Modulus 1024 Asdm Download
Send > Wait a couple of minutes and try again.
REMEMBER: I’m assuming you have SSH setup correctly if not, see the following article;
Related Articles, References, Credits, or External Links
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