Solved: SharePoint 2019 ERR_HTTP2_PROTOCOL_ERROR
2022-06-29
- Navigate to the registry key 2.HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters.
- Add 2 new REG_DWORD values, EnableHttp2Tls and EnableHttp2Cleartext, to this registry key.
- Set both values to 0.
- Reboot the server