So it looks as if there is no point in the 'crypto key generate rsa' command if i follow it up with the 'crypto key generate rsa usage-keys label sshkeys mod 1024' command, i just wanted to make sure the first wasn't need for the second to work or something screwy like that. Jun 11, 2019 SW1 ( config)# crypto key generate rsa. How many bits in the modulus 512: 1024% Generating 1024 bit RSA keys, keys will be non-exportableOK Set the size of key to 1024 bits. If your Cisco Switch is running an older version of Cisco IOS image, then it is extremely recommended that you upgrade to latest Cisco IOS. Apr 23, 2018 ^% Invalid input detected at ‘^’ marker. R1(config)#ip domain-name howtonetwork.net R1(config)#crypto key generate rsa The name for the keys will be: R1.howtonetwork.net Choose the size of the key modulus in the range of 360 to 2048 for your General Purpose Keys. Choosing a key modulus greater than 512 may take a few minutes.
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.
Cisco Crypto Key Gen RsaSecureCRT: 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. SolutionOn 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
Send > Wait a couple of minutes and try again.
REMEMBER: I’m assuming you have SSH setup correctly if not, see the following article; Cisco Crypto Key Generate Rsa![]() Cisco Crypto Key Generate Rsa Command FreeRelated Articles, References, Credits, or External LinksCisco Ios Crypto Key Generate Rsa CommandNA
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Privacy OverviewCisco Switch Can't Generate Crypto Key Rsa
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