ONline issues...

i have a 77001 ps2 and all of a sudden have issues with joining a game on COD2 and COD3. i can get online and get to the online menu of each game but i cant join a game. I have changed nothing in my router to make it not connect anymore. i have my ps2 set on DHCP with a specific IP and also tried to use demilitarization mode and that didnt work either. i reset my router and modem and that didnt help. i dont understand why it wont connect to a game session

I sorta got a problem like that, Im no network guru but Im pretty sure I know what needs to be done to get a ps2 on the internet, everytime I try to connect I can connect but I never can get passed DNAS i get a -612 error ( Yes my backups are properly patched) ANd my settings are the same as rubberman, DHCP enabled, DMZ, and reseting doesn't work.

well it started joining the game sessions, i didnt do anything so i dont know.