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Certain websites timing out when trying to access them

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4 replies

by richardhoughton

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I'm running a win2000/xp network with DHCP enabled. The way I have set up DHCP is that the clients access the 2 domain controllers for their DNS resolving and if they cannot do it then the DC's forward it on to our ISP to resolve. This works 99% of the time but I have found that there are certain sites (www.hp.com www.adobe.com www.kodak.com to name a few) which always time out when I try and access them. I do have a firewall but on doing a tracert at the cmd prompt it doesn't even seem to get anywhere near the firewall to get outside, and there is nothing on my firewall logs. Also seem unable to ping these sites. However, if I plug a laptop directly into my router and point it at the ISP for dns resolving then I am able to reach these sites.

Would appreciate and and all help you can give!

4 replies

by mrbill-

First you might want to post this in the Tech Q&A section, you will get a better response. Have you tried IPCONFIG /FLUSHDNS on any of the systems?

by richardhoughton

Yeah I have tried the ipconfig /flushdns - doesn't seem to do much. Will pot it to the Tech Q&A aswell - so thanks for the pointer there!

by lcampbell

Should check cache on local DNS. Make sure the local DNS is not rerouting your queries internally. This of course would result in time outs.

by richardhoughton

Have flushed the DNS cache previously and the DNS is set up through DHCP to forward any non internally resolved addressed to the ISP.

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