OWA and changing passwords

I have a problem. I upgraded our server from Windows 2000 to Windows Server
2003 that had Exchange 2003 installed. We had in initial issue with people
not able to change their passwords in OWA. I had to register a dll and was
able to do so but after I change my password I get the following message:

Internet Service Manager
for Internet Information Server 6.0

Password successfully changed.

" Back to "https://mailserver.abc.com/exchange/userid/?Cmd=close

When I click to go back to https:..... I get an error page and don't go back
to you session. Also when I try to logoff I get an error page as well I
believe it's 500

I'd appreciate any assistance in this matter. Thank you.
.

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