Cannot get to 1 external web site

I just removed ISA 2004 from an SBS 2003 server.  I did all per the steps given by Microsoft and everything seems to be working PERFECTLY fine except 1 site.  From INDSIDE the domain, we cannot get to the OWA site that has a completely different name than the local domain (dimain is ABC.local and the email and OWA is DEF.org/exchange.  We can get to www.DEF.org but as soon as we try to go to /exchange it fails.  All access to it is perfectly fine from outside of the office but inside users access the web site and a link to there OWA email from there.
cirving13Asked:
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David Paris VicenteSystems and Comunications  Administrator Commented:
Can you specify please.

Remove Isa but you install other Isa server?
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cirving13Author Commented:
No, I installed a SonicWall TZ215 device.
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David Paris VicenteSystems and Comunications  Administrator Commented:
Ok. Probably you have to check the certificates on the firewall.

DO you install the OWA/Exchange certificate on the firewall?

Let us know.
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cirving13Author Commented:
No but again, it works perfectly fine from outside of the office so I assume it is not a cert issue.
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David Paris VicenteSystems and Comunications  Administrator Commented:
Oh ok misunderstood sorry.

IIS logs on the exchange server what are they reporting. Any error´s or warnings?

Can you put them in here
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carlmdCommented:
If your web site www.def.org served from a host on the lan, or hosted outside?

Your problem is that the Sonicwall will not permit traffic from the LAN to address content on the WAN ip address. You need to use the internal lan name or ip for the OWA server. Or, if you have your own dns server, then chang resolution for DEF.org/exchange to reference the lan ip.
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