400 Bad Request Error with ADFS


I spent waaayyyyy too much time trying to resolve this problem so am capturing it here in case any of the rest of you run up against this.  I installed a new ADFS 3.0 on Windows Server 2012 R2 machine in my environment, and then configured a new SharePoint SPTrustedIdentityTokenIssuer for it.  Every time I tried to authenticate to it I entered my credentials, and then I would get a 400 bad request back and the whole thing came to a grinding halt.  I was getting no errors in any of the event logs on the ADFS server.  What was also weird is that if I configured ADFS to use forms based authentication instead of Windows, I could log in just fine.

I suspected Kerberos SPN issues, but when I had tried to set it after setting up ADFS (using setspn) it said that the SPN was set.  Well, guess what – turns out that was not true.  I finally just went in to adsiedit.msc on my domain controller and looked at my service account.  If you go into the properties you can scroll down to servicePrinicpalName and see exactly what's configured for it, and sure enough, my ADFS server was not listed there.  So, I just added the SPN needed for it – http/yourFqdnAdfsServer – saved it, and authentication started working then.  As always, note that the SPN is NOT a Url, like http://myserver, it's just the protocol and host name, so http/myserver.

Hopefully this will save you some time, I know a lot of folks build all this out in their labs at home so start by double-checking your service account SPNs.

Comments (15)

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  2. IT_Gerry says:

    You are a rockstar… thought I was in for a long Sunday trying to figure this one out (I migrated from ADFS 2.1 to ADFS 3.0) and could not understand why it wasn’t working. So simple. Thanks so much.

  3. Samuel Betts says:

    Brilliant, that just saved me a huge headache 🙂

  4. Ed (DareDevil57) says:

    Awesome! Thanks for sharing.

  5. Steve, bingo. This should be the first result on bing with ADFS 3.0 HTTP 400. 🙂 Thanks as always.

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  8. Brandon says:

    Dude! YOU ROCK!! What a life saver. I wish Microsoft, the producer, published this type of info!

  9. Chad Ray says:

    Is it possible your ADFS server name was the same name as the federation farm? I just ran into this issue where that was the case, turns out it’s not recommended. I manually entered the HTTP endpoint as you suggested and that worked for me – but it leads
    me to believe that if the two weren’t the same, then the SPN might have been set for you.

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  11. julien says:

    Thanks, did the trick for us too

  12. Kirby! says:

    I wish I had Googled before I opened a case with Microsoft….this fixed it while waiting on a call back. Thank you!

  13. Bryan Marks says:

    seriously? that fixed my problem…I could kiss you..Thanks so much…but cmon Microsoft!

  14. Bob Hyatt says:

    I was so happy to see this post. until it didn’t work for me 🙁 I still receive the 400 errors.

    question, after my setup I did have
    host/fqdnmyserver
    there already. I added the necessary http/fqdnmyserver but no go.

  15. Kenbluck says:

    Thank you, you saved the day.