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There are a couple questions:
You mention Firewall is it a hardware firewall or a software firewall installed on the system you are having problems with. IT is hardware on hte network it isn't a hardware problem with the system. It might be a hardware problem with the firewall that is dropping DNS resolution packets to your dns server (this is also assuming you are using an external DNS server and not running one internal to your network... there are a lot of assumtions here) It might be a problem with the external dns server. If it is siftware firewall on the machine then there might be your issue also.
When did this start to happen... all of a sudden or what was the change that caused this to take place. You state it is random and move from machine to machine. Wht type of router are you using? There might be a limitation with the number of hosts your router can support on an internet connection. It does not seem like it is specific to a mahcine configuration unless you just upgraded all of those machines recently (maybe a windows update??) since it moves around it sound like network capacity to me... and it might be router or firewall dropping DNS packet to UDP 53 (DNS resolution)
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this seems to be a common problem with IE... I took down my firewall and the problem seems to not be there... but i know I'll have to do something other then this to cure the problem
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i had the same problems as many descibed above - but was on dial up ntl connection.
have now switched to bt broadband - from the second i switched i haven't seem the message, and have never had a seconds problem......i tried many of the suggested solutions, none worked, but am now trouble free - no idea what the moral of the story is tho!!
