Why could I browse one website, but not another using VPN?

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fnova said:
I can browse www.marriott.com, but not www.hilton.com when connected to my
companies VPN. My laptop is running W2K and IE 6. If I disconnect from
the VPN I can access all websites. Any ideas on how to troubleshoot are
appreciated.


Does using your VPN mean you are using a different DNS?
If so, start with nslookup and find out if the difference is in the DNS.
Signs of difference could be delay in doing the lookups,
in which case it may also be a good idea to try a ping or tracert
to ensure that the lookup is cached before asking IE do it.

It may also be a good idea to clear the dnscache
if you switch access without booting. E.g.

ipconfig /flushdns

or you could just disable the cache completely

net stop dnscache

but then you would lose the performance benefit
if your nslookup test indicated that you might need it.


The best way to answer questions such as this is to take packet
traces and compare them. As long as you are comparing traces
you don't really need to know exactly what you are looking at just
to notice differences. You can capture traces using netcap
from the XP Support Tools and format them using Ethereal.


Good luck

Robert Aldwinckle
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