[Help] Starting the Tahnnakai Temple mission!!

This is kinda annoying. Well I played the Tahnnakai Temple mission 2times and failed. When I tried 3rd times, it hung for a some sec. then tells me err=005. All my internet works fine.
So I waited 30mins tried it again but same. And then I check all firewall, checked gw.exe allowed. Anti-virus program too.

I re-tried many time but mission is not start again and gives me same err code.

Is it Arena net problem ?

Update...Well Right now I tried it again. Guess what happen? After log-in and chosen character, It hung. So It gives me same error code 005.

I asked my friend from Korea. he said he has a problem log-in then much later called me it fixed and he's playing game. Arrr...

Although they wont admit it and blame your connection or set up...YES