sometimes it happens that tring to connect via ssh to a pix firewall you receive this error:
> ssh_exchange_identification: Connection closed by remote host
i found on internet this solution that worked for me; the trick is regenerating the RSA key of the pix with these commands:
ca zeroize rsa
ca generate rsa key 1024
ca save all
On new ASA appliance, like ASA 5505, the new commands are:
crypto key zeroize rsa
crypto key generate rsa general-keys
ca save all
