The Enemy Territory: QUAKE Wars Website has word to expect the version 1.2 patch for Splash Damage's teamplay shooter at some point today, which will include some downtime for the master server:

The 1.2 Update is currently undergoing final testing and checks, and we're currently plan to release it later today. In anticipation of the update, the Enemy Territory: QUAKE Wars Master Server will be down for maintenance from 16:45 GMT to 17:45 GMT / 9:45 AM PST to 10:15 AM PST. You will not be able to log into your online account during this time and, once the maintenance has been completed, you will need to have updated your game to version 1.2 before you can play online again.