On 11/22/05, akonstam@xxxxxxxxxxx <akonstam@xxxxxxxxxxx> wrote: > Suddenly ssh-ing to any of our machines causes the following error. > /etc/ssh/ssh_config line 40: Unsupported option "GSSAPIAuthentication" > Anyone know what that means? For some reason, GSSAPIAuthentication is set to "yes" in the default ssh_config file distributed with FC4. This causes the client to issue a DNS query looking for _kerberos.<FQDN> every time you execute the ssh command. I found this one evening when my ISP service was dead, but I still wanted to ssh into another machine on my home network. There was a mysterious delay in the login that was revealed when I ran a packet capture on the client. The delay was due to the absence of a DNS server for the _kerberos.<FQDN> lookup (because my ISP was dead). I set GSSAPIAuthentication to "no" and the delay disappeared. Unless you're actually using GSSAPI authentication, you should be able to safely set the flag to "no" in your /etc/ssh_config file. This still doesn't explain why you suddenly started getting the error, though.
