Network connection OK but Internet connection lost on laptop

I successfully installed 10.6 on my desktop first. Although I was connected to the network, I had no Internet connection. I fiddled around and did something that fixed the problem (not sure what). Then I installed on my laptop (family pack) and had the same problem: network connection OK, Internet connection not OK. Fiddled some more, but no joy. I've spent hours trying to get to the bottom of this, to no avail. Ran disk utility and network utility just for the heck of it. Anyone know what setting must have changed to knock off my lap top Internet connection? (I have Airport and WiFi through AT&T U-verse.)

In my case the DNS address is greyed out so I cannot select it. What worked for me - occasionally - is changing the Network location to 'Automatic'. I had it set on a custom setting. Unfortunately this is sporadic. It will start to display content then just stops. I can jump-start it by fiddling with location but not always. The Airport range seems to be reduced too but I think that is just the flakiness of the connection.

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Adobe support tells me Adobe does not support saving files to a server.
Neema: i understand that,InDesign does crashes on server.we have very limited support on servers
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Network connection OK but Internet connection lost on laptop

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