//problem:
ssh user@cisco_switch

//returns:
ssh_rsa_verify: RSA modulus too small: 512 < minimum 768 bits
key_verify failed for server_host_key

//solution (use SSHv1)
ssh -1 user@cisco_switch

/*...and if you have access to configuration mode enable larger RSA modulus in router. The modulus of the ssh RSA key pair on the switch/router is too small. If you have access, generate a new key pair on the switch/router with a larger modulus. */

crypto key generate rsa general-keys modulus 1024


..as always :)

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