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Problems using host headers

I'm running IIS 5.0 with Windows 2000 server. My problem is I have two sites on which I'm using host headers and sharing one common IP address. Both were working fine, but now one of the sites that uses port 81 is not accessible by the site name. The only way the users can reach the site is to use the http://name:81. I would like to know what could be my problem.
There have been a handful of bugs that cause problems using host headers. You had it working for a while, so at one point you had a compatible patch level. It's possible that a software upgrade, patch installation or other configuration change caused a system file to be replaced with a flawed version. So, it may be worthwhile to reinstall the latest service pack and hotfixes on your IIS system.

You obviously know how to configure host headers, because you had it working. It's worthwhile to verify that both sites are configured to communicate on port 80 and have the correct hostnames. Once you verify the server configuration, double check that the hostname being entered into the user's browser exactly matches the hostname entered into Internet Services Manager.

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