[quote name='Zyzomys']TMK, I opened all the ports that you listed for SCEA and I had lots of trouble last night. I did have major problems (error 00180000) and all the ports required for for PSN and SCEA are open on my router. Since my system is set up exactly as recommended, the problem is a Sony issue, not a user issue. Resistance 2 is the major game release this fall for Sony, the game Sony delayed Killzone 2 for, and the servers suck! It is time for Sony to step up and fix these problems.[/QUOTE]Did you make sure you opened them up on the same local IP your PS3 is set to by checking network connection list? If you do not run a static IP for your PS3, it's local IP can change. Also, for the changes to take effect, you must have your PS3 reset after the ports were opened on the router (that just means turning it off then on).
I mention about the network connection list because there were times I thought I had the DMZ open for Warhawk, but when I played I had tons of issues. Come to find out since I previously had my PS3 on auto for assigning the local IP, it changed it so the ports were being opened on another device. Once I switched it, it worked. I'm just letting you know in case you did this.
Also btw, I set up my PS3 on a static IP, by manually entering all the info (but I actually had to or my router would struggle to assign a local IP, so I had issues logging onto XBL, Wii, and PSN). I recommend people do static IP, but if their PS3 has no issues connecting online (with ports and/or DMZ open), then don't worry.
Then all I have to say is, what SHOULD SCEA do when on their end, they have the proper ports forwarded just like me, and never run into an issue? That's the hard part about networking, because that's where I currently am. I haven't had a single issue, anywhere since the port forwarding (compared to having a crapton of issues, and I mean several).
But like I also said, if you are connecting to another game, it might very well be the host/leader of that game's fault who disconnected, causing everyone else to disconnect.
Btw, Sony delayed Killzone 2 because R2 was further along than Killzone 2 (despite Killzone 2 being in development since 2005. Also probably, they had more faith Insomniac would finish on time than Guerilla) and there was no way they were going to release two FPS in one year during the Holiday season (that would divide the audience too much).
I'm guessing by your response, you didn't play the PS3 version of CoD4 online.

Disconnects in that game were bad even when I opened the DMZ (and it wouldn't let you deny invites, wouldn't reconnect the party when leaving game, and many other issues).
And sorry for recommending too much everyone, but I also have my DMZ open on my PS3 local IP along with the ports forwarded. I dunno if that helps me also. Although it's tough to explain, routers can get complicated and some errors could be a certain checkbox being checked (I know with the router at my old apartment, it was the reason I couldn't connect to games in the Lost Planet demo on PS3).
To let everyone know, I am watching very carefully at R2 and trying during multiple times. If I get a disconnect or any error code when loading up my buddy list, I will post it.