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DNS cache on a Windows machine?

A

Ace69

Senior member
Is there a DNS cache of some sort on a WIN98 machine? The reason that I am asking is because we have some customers that are having problems resolving names. Is it the lmhosts file? We have noticed that if someone has our DNS servers input in their TCP/IP settings they will not work for some reason. However, if we input another DNS, it works! The odd thing is after we switch out the DNS numbers to the other one and then switch back ours again, it works! Some other guys are thinking that the DNS cache on their system is corrupted. My question is, where is this "DNS cache" because I have never heard of such a thing on a workstation?

Thanks,
 
There is no DNS cache on a Win9x machine.

The lmhosts file shouldn't be the problem since it sounds like you have modified it. You can check it anyway if you want.

Until you mentioned switching it back and it works I thought it may be a forwarding issue on your DNS servers, but since you say that I'm stumped.
 
I didn't think so either. Some people here don't know their arse from a hole in the ground. I have found out that it is not the lmosts file because that is strictly NetBIOS. We just have no idea what it causing this issue. It is just really strange.
 
I would still look at your DNS servers. Now the real question is, is this just happening at a certain clients site, or all clients affected?

Phsyco's right. This is a stumper. But it is not the LMHOSTS file.
 
This has only affected a limited amount of clients. We now think that it could be some kind of worm that infects customers' machines. That is about all that we can think of.
 
Windows boxes DO do some DNS chaching..

It has been my experience through my own actual testing of changing DNS entries, that Windows boxes will cache that old entry in their memory for a while, and will not pick up the new one until you reboot...

This was NT 4 so your milage may vary on other Windows version though...
 
We have found a temporary fix. First, we remove our DNS servers and reboot with no DNS servers in the settings. Second, we input a temporary DNS that we set up and reboot once again. When it comes up after the second reboot, it works. We don't want to use that temp DNS all the time, so we take that out and input the old DNSs in there and reboot and it works again!

It is really odd, all we had to do was input another DNS, reboot and put the same ones back in, and it works! It seems like there was some kind of problem with those old DNS serrvers on their system and when we put in another and overwritten what it overwrites and put the old ones back again, it works just fine.

Very strange.....🙁
 
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