I have a client who is having problems logging into ssh. We have password authentication turned off so he is using a public/private keypair. He can make contact with the server but as soon as he enters in his passphrase, the server disconnects him. I have been able to connect fine using his private key and passphrase. I also verified that the firewall is not blocking his IP address. Does anyone else have a suggestion in troubleshooting this perplexing problem? Thanks for any help.