Garry's Mod NO SERVER

[Who Kicked Me?]

No servers list on the server browser for gmod...

I have tried everything, no theres nothing with my specs i run the game fine in singleplayer, this seems to jarate me off by LEVELS why wont it work? its supposed to, i guess? i was able to play multiplayer many times before, and now it doesnt, how typical me, i dont know WHY it doesn't work, it just doensn't work it said, "hey i dont wanna work right now haha screw you!" Well not littirally but this has been really annoying, why doesnt steam QUARENTEE its working ?? If the multiplayer doesnt work in the first place for my computer why doesnt steam notfiy me, i dont know if theres any port to open, but it didnt say somthing like that on the game product's home page, i have tried turning off my antivirus, it didnt make a diffrence at all, still a blank server browser shining up, as said, i havent made any changes to my internet box whatsover since i was able to play it online, i havent checked my firewall yet, but remember Unblocking HL2.exe