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Dynamics 365 Community / Forums / Customer experience | Sales, Customer Insights,... / Blank page when viewin...
Customer experience | Sales, Customer Insights,...
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Blank page when viewing CRM through Web Application Proxy

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Posted on by JinsengIT 42

I have three instances of Dynamic CRM on-Premises (8.1, 8.2, and 9.0).  They're all using the same Server 2019 ADFS server and everything works great internally.  They're published to the internet using a Server 2019 WAP.  I can even log onto the WAP and pull up the IFD URLs for the CRM servers without any issues.  When I hit them externally, I'm properly redirected to the ADFS authentication page where I successfully authenticate.  Then I'm redirected back to the original CRM URL I requested, the browser spins for a while and then stops and leaves me with a completely blank page. The tab name updates to "Microsoft Dynamics CRM" and viewing page source does have some content in it.  So I know something is being passed.

 It seems like CRM doesn't like Windows Server 2019 Web Application Proxy.  I know it's not officially supported, but has anyone gotten it to work or know why something simple like a WAP would be incompatible with CRM?

I'm posting this here instead of in another forum because publishing a generic html page works fine externally, so I know the WAP works.

Thanks a lot.

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  • Suggested answer
    Hüseyin Sahin Profile Picture
    Hüseyin Sahin Microsoft Employee on at

    Hi JingsengIT,

    indeed CRM 8 does not support Windows Server 2019 and ADFS 5.0 with WAP 2019.

    CRM 9.1 does support Windows Server 2019, ADFS 5.0 and WAP 2019. (The official software requirement documentation is updated)

    The issue you are facing here is that HTTP/2 on WAP causes the loading problems you are facing.

    There is a know problem with WAP already discussed: social.technet.microsoft.com/.../web-application-proxy-2019-sharepoint-2016-and-office-online-server-sites-wont-load

    Suggested workaround: (Disable HTTP2)

    -> Change needs to be done on the WAP Servers !

    PowerShell (elevated):

    Set-ItemProperty 'HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp\' -Name EnableDefaultHTTP2 -Value 0

    Registry Key:

    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet

    Settings\WinHttp\EnableDefaultHttp2 Type: Dword

    Value: 0

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