Server works for others but not for me on gmod

[DarkBillie]

So ive setup a server for me and my friends to play (like everybody else =P)

And the main problem is he can connect but when i try to connect it fails after 4 try's

so im guessing i cant be the ports (or else my friend couldnt connect either)
ive tried all 3 ip adress (external, 192.168 one and the 127.0.0.1 one) and none of them seems to work i also tried typing it with the port behind but also nothing

any idea where this problem is coming from?

EDIT: forgot to mention this is about garry's mod =P

EDIT2: Seems like the fix was to get rid of the -ip and -port >_<