latitude wireless connected but can't connect to remote server

Question:
latitude wireless connected but can't connect to remote server
Hi
I just received a Latitude D610 from work. Nice computer.
I successfully connected it to my SMC wireless router - ssid disabled, mac & wep enabled - at home. When I'm at a client's workplace I can connect wirelessly but receive a no connect to remote server message when trying to get emails or get on the net. My Axim will connect to the wireless spot that the latitude won't connect to.
I've updated the wireless drivers, tried the windows and intel wireless prgrams, tryed disabling Zonealarm Pro, windows firewall is off.
Any suggestions would be appreciated.
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