KB ID 0001322

Problem

• Use this command to generate RSA key pairs for your Cisco device (such as a router). 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.
• Nov 15, 2019 sw3560-1(config)#crypto key generate rsa usage-keys label cisco modulus 768 The name for the keys will be: cisco% The key modulus size is 768 bits% Generating 768 bit RSA keys OK% Generating 768 bit RSA keys OK sw3560-2(config)# 00:04:17:%SSH-5-ENABLED: SSH 1.99 has been enabled. #Regenerate the rsa key so you can SSH into the device.
• Re: Generate RSA Key hi changing the modulus of the rsa keys will only affect vpns if they are using rsa nounces or rsa digital certificates for authentication in ike phase 1. If u are doing ssh into the box and then changing the modulus i guess it might break ur current ssh session however i am not sure. But u can create a backup session via.
• Mar 24, 2011 VPN Study Guide - DMVPN with RSA-Signature Authentication Proctor Labs Configurations (POD 108): R2 R4 R5 R6 ASA1 CAT1 CAT2 CAT3 CAT4 PC ACS Configuration Tasks Configure R6 as DMVPN Hub, and R2/R4 as DMVPN Spokes.
• Crypto key generate rsa exportable modulus 1024% The key modulus size is 1024 bits% Generating 1024 bit RSA keys, keys will be exportable.OK despues quiero enrolar. Crypto ca enroll CERTIFICADO. Pero al enrollar mi terminal genera una llave de 512 bits. Porque puede ser eso? Mi equipo es un cisco 1811 flash:c181x-advipservicesk9-mz.

Crypto key generate rsa Device(config)# crypto key zeroize rsa. The label is important, I'll tell crypto key generate rsa modulus you! Wh selfinvest stock box Crypto key zeroize rsa Specifying a Storage Location for RSA Keys When you issue the crypto key generate rsa command with the storage devicename. If you want to generate RSA key pairs, use the crypto key generate rsa command: hostname/contexta(config)# crypto key generate rsa. If you do not use additional keywords, this command generates one general purpose RSA key pair. Because the key modulus is not specified, the default key modulus of 1024 is used.

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. Office 2016 pro plus key generator. 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

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! Generate public key from ppk.

Tools > Command Line Interface > Multiple Line

Send > Wait a couple of minutes and try again.

Site Cisco.com Crypto Key Generate Rsa Program

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

Crypto Rsa Decryption Error

Related Articles, References, Credits, or External Links

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