Web Access Protection causes blank pages

Hello all,

A friend of mine's calls me to help him to solve a strange problem.

For some URL, any web browsers (IE/FF/Avant Browser) received systematically a 400 bad request though, on my PC at home every thing is ok...​

We tried deactivating Web Access Protection and everything was OK.
He had EAV 3.0, I suggest to upgrade to EAV 4.0 but problem remains...

Reseting to default settings did not change anything...
So currently, the temporarly solution is to deactivate Web Access Protection.

Is there somebody here, having the same issue ? Anything to do to solve this problem ?

Regards

 

Any further information about the OS and the platform (32 or 64-bit) ? Maybe there's an interference with other software so a log from SysInspector would be of help. You'd better contact customer care and provide them all the necessary information.

 

The OS is windows xp sp3.
I uninstalled any other possible software that might cause this :
> Spybot & Tea timer etc...
No more antimalware, firewall (except windows xp ones)...