OWA - Bad Request (Invalid Hostname) / Owaauth.dll

Posted on 2007-08-10
Medium Priority
Last Modified: 2009-07-29
Hello All, I have the following problem with one of my exchange 2k3 SP2 front end servers.

This new FE, owa-ex01, server can talk to every single server except for one BE, prob-ex01, (of course the only one I really need it to connect to.)  Set for SSL Cert (owa.domain.com) and Form Auth.

My main FE, webmail-ex01, server is running fine.  It will connect to every single BE server, even the above "problem" one.  Set for SSL Cert (webmail.domain.com) and Form Auth.

The new FE server has been added in to support our (uhhhgggg Entourage Mac clients)  The FE server is local to them so that they do not need to traverse wan to find the main FE server.

When I try and access any account on this specific server, prob-ex01, FROM the new FE server, owa-ex01, I get the following errors:
IE - Address Bar: https://owa.domain.com/exchweb/bin/auth/owaauth.dll
Page Cannot be found  HTTP 400 - Bad Request

Firefox or IE with friendly Errors off - Bad Request (Invalid Hostname)

I've tried going though and reseting directory permissions
Deleteing and having the 6 IIS directories recreated
Made sure the IUSR_ and IWAM_ accounts have proper passwords

All servers are running MS Server 2003 SP1 and Exchange 2003 Sp2.
Question by:CrazyStand
  • 2
LVL 104

Accepted Solution

Sembee earned 2000 total points
ID: 19674184
Invalid hostname normally means a bad host header.
If you are using SSL then you cannot use host headers. If you have configured host headers then remove them. Make sure that you have done that on both the backend and the frontend server.

Make sure that any SSL certificate and any setting for require SSL has been removed from the backend server. All SSL type activities should be done by the frontend server only.


Author Comment

ID: 19683596
Spot on!  Thank you so much.  3 Clicks and I'm back up and running.

SSL has be configured on the Backend.
Host headers had been set on the FE and BE server.

That was killing me!  500 points to you.

Expert Comment

ID: 22348628
I have the same issue, but it works internally and NOT externally using the same FQDN....?
LVL 104

Expert Comment

ID: 22349208
lseeman - this is an old question. Unlike a forum it is not possible to "bump" questions back up the list. The only people who will see your post are those that have already participated. Instead you should post your question as a new question in the Exchange Server Zone which will allow other experts the chance to see the question and respond.

Exchange Server Zone Advisor.

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

As much as Microsoft wants to kill off PST file support, just as they tried to do with public folders, there are still times when it is useful or downright necessary to export Exchange mailboxes to PST files. Thankfully, it is still possible to e…
There can be many situations demanding the conversion of Outlook OST files to PST format and as such, there is no shortage of automated tools to perform this conversion. However, what makes Stellar OST to PST converter stand above the rest? Let us e…
To show how to generate a certificate request in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.:  First we need to log into the Exchange Admin Center. Navigate to the Servers >> Certificates…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Suggested Courses

809 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question