Orchestrator URL Is Inaccessible With Error Code " ERR HTTP2 INADEQUATE TRANSPORT SECURITY"

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Orchestrator URL is Inaccessible, error code is "ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY"

Issue Description: Nothing has been changed at the Orchestrator side, but suddenly Orchestrator URL is inaccessible. The error code received is ERR_HTTP2_INADEQUATE_TRANSPORT_SECURITY.


Resolution:

  1. Check with the window security team and make sure nothing is changed on CIPHER side, revert the CIPHER if they did the changes
  2. Use the command gpresult /H to get the group policy result, compare this file on both working and non-working machines, change the setting to good one if there is something different
  3. Install the IIS Crypto tools to disable the weak cipher suites on the issue Orchestrator machine https://www.nartac.com/Products/IISCrypto/
  4. Add registry to disable the HTTP2, contact the security team if it is working, there is something CIPHER setting needs to be modified

[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\HTTP\Parameters]

"EnableHttp2Tls"=dword:00000000

"EnableHttp2Cleartext"=dword:00000000