wifi connected,unable to access gmail and other apps.

[#1]

After updating my phone to android 2.1,I'm unable to access my gmail and other apps thru. wifi. I have the wifi symbol at the top which clearly shows that the wifi is connected,but when I try to access  gmail,android market and other apps.,it gives me message stating "no network connection".Please give a solution.

[#2]

Similar here: Sometimes, WLAN is up and running fine, after a while or when roaming between different 802.11g compliant AP or HSDPA/UMTS, the WLAN connections seems to be up - but there is no TCP/P traffic over this network link. Typical effect of the connectivity issue are also sync failures.

Attempted to keep WLAN up always (Wi-Fi settings -> Menu button -> Advanced  -> Wi-Fi sleep policy set to Never) - slightly better (except of the obvious battery drain!) - but experiencing more unexpected crashes (or nicely said automatic restarts) now.

Same before on 1.6 by the way - WLAN on the X10, X10 mini nor the mini pro is reliable for us here.

It's good to have 2.1 on the Xperia now - but it's still a long way to go to a competitive industry standard device.

-Kurt.

[#3]

Have you tried connecting without any encryption. I bet it works.

I have that issue on the X8 - the device will well connect to the router but simply no encrypted data will be transferred. Turning encryption off "solves" the problem. Why that is the case? No clue!

Greetings.

[#4]

Thank u guys for ur suggestions that was really helpful.I can connect to my wifi now.I had reset my router settings now and it works great.

-kartius.

[#5]

My wifi connection frequently fails. I've noticed it usually happens after I've downloaded an app from Android Market. I read on a different topic that changing the encryptation from WPA to WEP often helps. I don't see where this can be changed, though. Do I need to eliminate the connection I already have and set up a new one? I know I was asked what type of encryptation I wanted to use when I set up the service originally, but now under Advanced wifi settings, I don't see anything about encryptation.