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Exchange 2007 OWA not working externally

Posted on 2009-03-30
Medium Priority
Last Modified: 2012-05-06
I just installed an addtional Exchange server in my Exchange Org. The Org started out as 2003 but I have added a 2007 server that has the CAS, HUB and Mailbox roles running on a 2008 server. All is working except OWA externally. while I know i have not install the web cert on this box as of yet, i would think that OWA should still work. From an external client I goto the web address of the OWA server, i get the cert warning, i click continue and then get the following message:

The URL you requested has been blocked. URL = invalid.

I know the my firewall is configured corectly as I am getting email on port 25, i can RDP in on port 3389 and i get the cert warning page, all of which are on the same box.  I have made sure that the interal and external address is the correct within Exchange Management console for Server config and client access.

any help would be greatly apprecaited.
Question by:SpeedRacer1972
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Accepted Solution

kollenh earned 1500 total points
ID: 24022579
Actually it has a certificate, it's just self-signed, iirc.  Have you tried hitting the internal link for OWA and does that work?  Also verify your settings for OWA; via the EMS:   Server Configuration --> Client Access, right-click OWA --> Properites.  There will be both "Internal URL" and "External URL" on this page.  Then make sure those settings match the IIS configuration on your server.
If you can get to the internal link/url but not the external then you should look at your firewall settings.  Are you doing a blanket forward (all ports) to the server?  If so, I'd suggest changing that and only allow 25 & 443.

Author Comment

ID: 24022709
I can get to the OWA internally, just not externally. I am only forwarding 25, 443, 3389 on the firewall. The URLs for internal and external are set to be the same in ESM. I guess i do not know IIS on Server 2008 well enough to check if they match. I have looked in all places i can find and have no luck. i assume the setting i am looking for would be under sites\Default Web Site\OWA.

Assisted Solution

kollenh earned 1500 total points
ID: 24022752
Yes, that is the correct path.  You don't really want to do any setting changes there, just make sure the path in IIS matches your settings in Exchange and that it's running as an application (it looks like a gear when it is).
So if your internal link works but not the external, sounds like a firewall or routing issue.  You say the URLs are the same, how so?  Is your external link using an "external" dns name?  How are you testing external connectivity?  Have you tried using the external IP address in place of the name?  Example:  https://IP/owa.
And I apologize for not noticing you're running on Server 2008, there are some changes when running Exchange 2007 on that so I'll go read my notes and make sure I'm not overlooking something.
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Author Comment

ID: 24022977
the internal and external URLs are both set to the external DNS names, which is what my MX record is pointing to. I am able to test from my home network, hitting the OWA address. hitting the IP address does the same thing.  

I would think that if it were a firewall issue, using a Fortinet WiFi 60B, them RDP or SMTP would not work which are all forwarding in the same firewall rule to the same IP.

Author Comment

ID: 24023101
so i decided to take a harder look at my firewall. As it turns out Fortinet considers the actual address of my OWA server as in valid. I had a check box to block invalid URLs, as soon as i unchecked that the started working. Thank you for the help

Assisted Solution

kollenh earned 1500 total points
ID: 24023478
Aha!  That's good because I was fairly sure it had to be firewall-related since that seemed to be the only difference you had in your two tests.  Glad to help.  Let the web-based mail goodness begin!
As a side-note, if you have Outlook 2007 users, I can't say enough good things about Outlook Anywhere.  Having your full Outlook client work over the internet without a VPN is very nice.  Only downside is you would need a real certificate.

Author Comment

ID: 24023512
yes, i plan on settting up Outlook anywhere and a cert, i just wanted to get OWA working before i took any anything new.
LVL 65

Assisted Solution

Mestha earned 500 total points
ID: 24035454

"The URL you requested has been blocked. URL = invalid. "

Is not an Exchange message. Therefore it is being blocked elsewhere. Firewall would be the first place to look, possibly something that needs to be configured with a specific URL rather than just a port being opened.
A quick Google points at this being a Fortigate error, which you have mentioned, so I would be looking there.


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