OWA 2003 not working because of DNS issue

I've got an Exchange 2003 server running with OWA on that server, one server environment, 95 mailboxes.  I had a DNS issue on Friday which could be the root of the issue but I don't know at this point.  That day the active DNS file was overwritten by a 0KB file, I looked into the backup and restored a 13KB file.  DNS is running on a separate Win2K server in the same W2K domain.  No problems with anything Friday, Saturday or Sunday.  Even Friday when I had the issue with DNS I was able to get to OWA.  This morning sometime OWA stopped working.  I cannot get to OWA through anything but IP Address at this point.  I have SSL setup so I should be able to get to it via https://mail.mydomain.com  I also should be able to get to it through servername/exchange but neither are working which tells me its a DNS issue.  I looked into the DNS file in detail and have compared, the DNS file is accurate.  Could anyone tell me where to look next?  Is there something I'm not looking at?    

Thanks in advance
dmh
dherrmannAsked:
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moduloCommented:
PAQed with points refunded (500)

modulo
Community Support Moderator
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fsckedCommented:
So what do you get if you go to

https://mail.mydomain.com/exchange

That should work.
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dherrmannAuthor Commented:
I get a cannot find error:  

Cannot find server or DNS Error
Internet Explorer

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fsckedCommented:
go to a command prompt and do

nslookup mail.mtdomain.com

what do you get back?
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dherrmannAuthor Commented:
I got the correct IP address and DNS name of the server.  Since my original post I've noticed that when I go to mail.mydomain.com it actually knows about the secure socket, the URL changes to https://mail.mydomain.com/exchange  but I get an error page that tells me there's a DNS issue.  I've been looking through some of the other posts here and am considering trying to put IIS on that server back to defaults to see if I can get resolution.  

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dherrmannAuthor Commented:
I have a user who's VPN'ed into the network on a MAC, in IE he can get to https://mail.mydomain.com/exchange no problem.  When he tried Netscape he got an SSL error.  I have installed Netscape and Mozilla browsers on my pc and I get the following error:  Could not establish an encrypted connection because certificate presented by mail.mydomain.com is invalid or corrupted.  Error Code:  -8182    So, I've now figured that the issue is not with DNS, but just with the SSL certificate.  Is there anything else I'm missing???

dmh
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dherrmannAuthor Commented:
Trying to fix an old cert ended up being a real issue.  On creating a brand new cert and installing it I resolved the issue.  
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