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OWA - HTTP 400 Bad Request

New server install.  SBS 2008, exchange 2007, IIS7.

When trying to access OWA internally via https://mail.server.com/owa can login fine and everything works fine.  When trying to access externally login page is dispalyed but after entering username and password it shows HTTP 400 Bad Request - Webpage cannot be found.

However using Firefox to access OWA externally it works fine.  

Any ideas, I think it might be a certificate issue

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8/22/2022 - Mon

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this is an odd error.

to understand the error 'bad request' - normally this is an issue with the web browser. try another machine or browser first to see if you have the same error.

next look at your firewall, somehow this could be mangling your https request.

try using light mode (firefox) so see if the error is with the ful version of OWA

make sure your server/exchange is fully patched.

this problem can also occur if your external address that you use to access owa does not match the outlook anywhere configured address.
to fix this
1)  open "Exchange Management Console"; expand "Server configuration" and select "Client access".
2)  On the task panel on the right, you should have the option to "Disable Outlook Anywhere" - click on that.
3)  Once the task has completed, you should have the option to "Enable Outlook Anywhere" - click on that.
4)  You will be asked for the external URL - type in exactly the URL you wish your users to use, ie. "https://server.domain/".
5)  Once that task has completed, retry your external access.

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