05.08.2020

Crypto Key Generate Rsa Modulus 2048

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Crypto Key Generate Rsa Modulus 2048 4,3/5 8244 reviews

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Cisco Generate Crypto Key
Crypto Key Generate Rsa Modulus 2048 Free
Crypto Key Generate Rsa Modulus 2048 Code

Problem

We need configure SSH on a Cisco router or switch in order to access it remotely, unless we're using an access server. Crypto key generate rsa modulus 1024 label.
Router(config)# crypto key generate rsa label ms2 modulus 2048 on usbtoken0: The name for the keys will be: ms2% The key modulus size is 2048 bits% Generating 1024 bit RSA keys, keys will be.
You can specify other modulus sizes with the modulus keyword. The minimum keysize accepted is 2048. You can also assign a label to each key pair using the label keyword. The label is referenced by the trustpoint that uses the key pair. If you do not assign a label, the key pair is automatically labeled RSA-Key.
Oct 02, 2015 Router(config)# crypto key generate rsa general-keys The name for the keys will be: myrouter.example.com 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.

Then a new certificate - it will use the new stronger private key you just created. No crypto pki trustpoint crypto key zeroize rsa crypto key generate rsa modulus 2048 label rsa key ip http secure-server (The last command will automatically generate a new self-signed certificate.).

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.

Cisco Generate Crypto Key

Solution

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

Send > Wait a couple of minutes and try again.

REMEMBER: I’m assuming you have SSH setup correctly if not, see the following article;