So I kind of forgot that I loaned my copy of Killzone 3 to my buddy this past weekend. Looks like I won't be able to test any of these fixes for a while
On the bright side, I was able to connect to a Warhawk server just fine last night, so it's either got to be Killzone 3 that's the problem, or I'm just an idiot. Who knows, maybe the servers were just down/really slow the couple times I tried? Maybe?