Cannot Connect to App Store via WIFI

[pacific82]

Hi everyone:
I've spent an entire week trying to fix the following problem:
When I connect to WIFI (using Linksys BEFW11S4 802.11b router) I can't search/download anything from the app store. When I search an app. it just says "Loading" and nothing happens. After few minutes, I get the following error:
"Cannot Connect to iTunes Store"

Interestingly, I can search and download apps when:
-I am using EDGE
or
-I am using someone someone else's WIFI

I have an Unlock/Jailbroken 1st gen. T-mobile iPhone (Firmware 2.0).
Can anyone help me fix this problem?

[captainjapanicq]

If it works on someone else's wifi and not on yours. There seems to be an issue with your router / wifi setup. Rested the network settings in your iphone and delete all saved wifi networks. What security are you using on your wifi?

[pacific82]

Currently, my security mode is set to "WPA Pre-shared Key." However, I have also tried it with the other two security modes (WEP and WPA RADIUS), and it didn't work with those either!
I have reset my network setting as well. No change!
Any other suggestions?
Thanks!