OWA: Can't log in with alias "webmail.domain/exchange"

Normaly I use http://webmail.domain/exchange to log in to my webmail, but now i can't.
http://localhost/exchange and http://ip/exchange do work.
Any idea
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check your dns records out on the internet using nslookup, make certain the record for webmail.domain = IP is pointing to the correct IP address.

from cmd line
set type=ALL
mydomain.com IP (where the ip address is the dns server address of your ISP)

look at your A level record for  webmail.domain.com =ip see if this is all correct

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