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Unable to send email through OWA when using AD FS pre-authentication

Hello,

we are unable to send email through OWA published through WAP server 2022 when using AD FS pre-authentication. Also delete of mail does not work.
No problem to read emails.
We use Exchange 2019 CU11.

Everything works when we make following changes (every other setting stays the same):
- we go through WAP 2019
- we change pre-authentication on WAP 2022 to pass-through
- we access internal OWA directly from WAP 2022

Looks like HTTP PUT is not going through when using AD FS pre-authentication on WAP 2022.

Any idea what to try to make WAP 2022 with AD FS pre-authentication for OWA work?

P.S. AD FS on WAP 2022 works for our CRM2016


Thank you,

Kind regards,
Richard



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Hi,

disabling HTTP/2 as default on WAP2022 resolves problem with mail send through OWA/WAP2022.

Disable with this setting:
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\WinHttp]
"EnableDefaultHttp2"=dword:00000000

You can still have Http2Tls enabled:
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters]
"EnableHttp2Tls"=dword:00000000


P.S. Also noted that HTTP/2 on WAP2022 is problem for SPS2019 and MS Edge. Other browsers including IE, Chrome, Firefox have no problem with HTTP/2 on WAP2022


HTH
Richard

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