Xiamin Evolution on linux box and winXP box as gateway

[keen_prat]

Hi..
I am using Xiamin evlution from long time to retrive my mails but suddenly from last 4 days it is not able to retrive mails.

I am on same setup as was earlier. Website's are opening fine on that box.

My setup is ..
Internet----> WinXPbox with NAT+caching --->LinuxBox with Xiamin.

It was always working cool but now now. Saying that operation timed out. And now i have no clue what went wrong. I thought may be ISP has done somethingwrong but I am able to use outlook on XP box fine. but I dont' want to use outlook as it is unstable.

Also sorry if I posted this in wrong forum.
PS: its urgent !!