Nameserver (DNS) failure, the connection May not work.
Linux - NetworkingThis forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.
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(assuming heavy = long = slow) Yeah, they will be, he's on dial-up.
If nothing else goes wrong apart from this error message, you can probably ignore it. There is a check on start-up of your connection that domain name services look-up works correctly (and your system is failing that test). If nothing else goes wrong, like failure to find websites that you know are really there, it probably only means that this test is being carried out before the link is really up-and-running or the timeout is set slightly too short for the speed of your connection and the speed of those nameservers.
If you are occasionally getting web pages not found and/or your performance is poor, ping your nameservers and check that the ping response times don't occasionally go through the roof (some of the lower cost isps don't really have adequate nameservers, particularly for their older, lower cost, services) and there may be a case for changing to other nameservice providers.