Invalid STEAM ID

[Celshock MP5]

The past few days i have encountered a message that appears saying invalid STEAM ID authentication and the server cannot verify with at 27 at the end. The past few days this has been occuring more and more. Is there something I can do on my side to fix the problem or is it just the server?

 

[lo3smokey]

Try logging off from steam its self click on file when you starte steam and click on were it says change users but make sure u know your pass word and junk...