Page cannot be displayed, pinging from command prompt works.

I have a machine that would not pull up any internet pages.  It was browsing just fine and then stopped.  I am using Internet Explorer 6 and cannot upgrade or downgrade versions as it's a company standard.  I am able to ping several addresses from the command line so DNS is working fine.  This has happened occasionally on a few machines I support and rebooting them resolves the issues.  I'm looking for the root cause as to what could be causing this.  Anyone have any ideas on what to check next time this happens to determine the issue?
c2arbonAsked:
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and235100Commented:
Try resetting winsock:
http://windowsxp.mvps.org/winsock.htm
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and235100Commented:
Otherwise - check your hosts file:
http://www.accs-net.com/hosts/how_to_use_hosts.html

You should only have a
127.0.0.1    localhost
entry present.
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and235100Commented:
Otherwise - disable any add-ons in IE6 from Internet Options \ Programs tab \ Manage add-ons.
If that doesn't work - try "repairing" IE6:
http://www.theeldergeek.com/repair_ie6.htm
http://www.theeldergeek.com/repair_reinstall_ie_and_oe_6.htm
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jasonmallisonCommented:
Also try ipconfig /flushdns and also double check IE's Proxy settings, unless it's required disable any proxy settings that are present.
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c2arbonAuthor Commented:
This doesn't seem to be the issue.  It's intermittent on a few machines.  It seems to resolve itself after about 5 minutes.  All the while pinging the sites returnes IP addresses.  Next time it happens I will try to put in the ip address of the site to see if that works.
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jasonmallisonCommented:
Hmmm... You say it resolves itself after 5 minutes. Does the machine work continuously without issue? Or does it come back? I'm assuming after reboot this occurs? Are these machines by chance multihomed? e.g.; multiple network cards with connections in both?
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c2arbonAuthor Commented:
It's not multihomed.  Any yes it will resolve itself after 5 minutes without doing anything other than waiting.  A reboot will result in the same.  I have a feeling it's something screwy with our company build, I'm just trying to get others thoughts on this very strange issue.  Also it may do it on one machine once and never do it again.  I'll have a random case on this every now and then, probably once a month or once every other month.
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jasonmallisonCommented:
Yeah this sounds pretty unique. Just a thought, what about a duplex mismatch between the NIC and your switch? This usually just causes performance issues rather than unresolved domains, but it's always possible... I guess, strange indeed. do the machines that exhibit the behaviour all sit on the same subnet?
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and235100Commented:
Can you create a new image - and try another computer with it - that should isolate whether this is a OS issue or not...
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c2arbonAuthor Commented:
Internet Explorer is the culprit here.  When the issue happened again I was able to browse using Mozilla Firefox.  Mozilla is much faster as well.
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RonCairnsIT MAnagerCommented:
What proxy server you are using ??
As you said its happening on more than one pc in you network, seems to be a network issue rather than IE6 itself.
Have you applied all the MS updates ???
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