Suddenly cannot SSH into server from LAN, but can from outside LAN?

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http://askubuntu.com – This is the weirdest problem I've ever had with trying to ssh into a server. Suddenly I can't ssh from my workstation to the server on the LAN. I can do so just fine from home, however. /var/log/auth.log isn't helpful, even with sshd logging set to VERBOSE: Oct 18 17:08:35 servername sshd[4171]: refused connect from ( The ssh -v output doesn't provide any helpful information either: [email protected]:/home/username$ ssh -v [email protected] -p #### OpenSSH_5.3p1 Debian-3ubuntu7, OpenSSL 0.9.8k 25 Mar 2009 debug1: Reading configuration data /etc/ssh/ssh_con (HowTos)