How do I get rid of "Steam validation rejected"

[Wolfy Snackrib]

Everytime I try to create a server in garrysmod it just says "Steam validation rejected" is there a way to get rid of this annoying piece of crap problem?

 

[MrBlonde]

http://forum.facepunchstudios.com/showthread.php?t=81239

 

[Wolfy Snackrib]

Not meaning to sound off like an idiot, but where do I put that server fix file?