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To fix the issue:

  1. Install Apex Central Hotfix 4363.
     
    Since the hotfix is not yet available publicly, you can file a Technical Support case to request for this specific hotfix.
     
  2. If issue persists or if installing a newer hotfix is not an option, you can manually disable HTTP/2:
    1. Open the Windows Registry Editor.
    2. Navigate to the registry key HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters.
    3. Add the following as REG_DWORD values to this registry key:
      • EnableHttp2Tls
      • EnableHttp2Cleartext
    4. Set the value of both Registry Keys to 0.
    5. Reboot the Apex One server.