Looks like they are already down. Been trying today Feb. 17, getting the message that the servers are not available at this time.
Looked around abit at the Homefront forums and apparently its been like this for a few days.
Checked the PS3 forums and its been happening there for a few days as well
Some are saying they can find skirmish matches, but I cant find anything
Hopefully Crytek will make them available again - I enjoy the multiplayer in this game