are you on spruce by chance?
Just noticed all of my sites are offline, I submitted a ticket.. but their status page shows no problem.
Port 22 is not open on the box, and it doesn't respond to ping (not sure if it would normally, but SSH should respond..)
--- spruce.dreamhost.com ping statistics ---
13 packets transmitted, 0 received, 100% packet loss, time 12149ms
~* telnet spruce.dreamhost.com 22
telnet: Unable to connect to remote host: Connection timed out
(Tried 22 from 3 different sources.. all fail)