I cannot connect to Metal Gear Portable ops Plus servers.

I get an error constantly when I try to connect.What should my upstream bandwith be?

Should my auto router setting be on?And my UDP port number is 5739.

The error is;

UDP port check failed.

(Error: P518)

What is P518?

Don't even bother.. The online is full of hackers and it's not even fun.. anyways I'm pretty sure you only have to port forward your router if you want to host a game, so If you are having trouble finding a game maybe no body is online ??