I'm trying to build a PHP mapiHTTP interface to solve RCA (https://testconnectivity.microsoft.com/) Exchange Server->Outlook connectivity test. I was able to pass `Autodiscover` stages and all `mapiHTTP` steps. Now I've problems establishing connection RPC over HTTP [MS-RPCH].
Then I get error message: ``` Attempting to ping the MAPI Mail Store endpoint with identity: xxx.de:6001. The attempt to ping the endpoint failed. Additional Details An RPC error was thrown by the RPC Runtime process. Error 1818 CallCancelled RPC Status: 1818 CallCancelled Timestamp: 11/5/2022 1:25:37 PM Generating Component: 14 (WinHttp) Status: 1818 Detection Location: 1390 (HTTP2ClientVirtualConnection__ClientOpenInternal10) Flags: 0 Parameters: 30000 ``` Any help appreciated!