Authentication error

Hello, iam using scf s4 files 7.11.65 cracked and sometimes having this error:
http://bildites.lv/images/awmguyf0811yhe6eg7dc.jpg

it shows up without reason, sometimes days without it, sometimes after some hours. it shows up like 240 thease windows, and after that gs closes, sometimes on main server, sometimes on subserver, but not together.
iam using win server sp1.
anyone have seen this error, and help??

tnx

i think there may be 2 possible reasions:
1. someone is trying to hack(frirewall helps, also go to shop and buy sum axe and visit this guy)
2. ODBC problem (set ODBC links manually)
might be some other reasions aswell but these 2 are most common