isa server client software installed pc browsing problem

We have isa server 2004 installed in all desktops and laptops.... some users they are carrying their laptops with them, Problem is these laptops now not able to browse internet outside (their homes or from internet cafes). Previously i dont have this problem, recently my isa server 2004 upgraded to sp 3 and os also upgraded to os sp2. (windows server 2003).
On these clients isa client software installed, eventhough we disabled and removed proxy settings from browser also not able to browse....
What could be the reason...? why we are not able to browse outside ?
In my opinion this isa client software should disable automatically, when you connect out side network, why it is not happening so ?

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Raj-GTConnect With a Mentor Systems EngineerCommented:
Under the "Auto Discovery" tab of ISA Server where you enable WPAD, you should see the port ISA is listening on. By default it's port 80 and if your ISA is running on a standalone server, I would leave it at that.
Raj-GTSystems EngineerCommented:
If you are using manual configuration, I would recommend enabling Web Proxy Auto Discovery (WPAD) to configure the clients. This will help the laptop users to connect to the Internet when ISA is not around.
nivasnetAuthor Commented:
After this do i need to delete (uninstall) isa client software from clients....

Raj-GTSystems EngineerCommented:
Nope. Just configure the client software to automatically detect the ISA Server and the browser to "Automatically detect settings".
nivasnetAuthor Commented:
i gone through your mentioned article, for testing wpad.dat i have use below mentioned url, there what port number i have to use, in order to get wpad.dat file.

You can test to see if you can get to the wpad.dat file by typing this URL into IE - http://servername:portnumber/wpad.dat
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