RPC Status: 1818 CallCancelled responding to CONN/A1 RTS PDU request
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]. RCA is sending ``` Host: 92.117.223.65:12000 User-Agent: MSRPC Accept: application/rpc Pragma: SessionId=7a6fca0d-d59b-4e54-8422-ef425c9e1132 Connection: close Cache-Control: no-cache Content-Length: 76 User: email address removed for privacy reasons Password: mamma Request: RPC_OUT_DATA /rpc/rpcproxy.dll?xxx.de:6001 HTTP/1.1 Authorization: Basic xxxxx ``` Pseudo code: ``` <PDU> <!-- Converted binary data received from client --> <MajorVersion Var="I1" Pos="0x0 (0)">5</MajorVersion> <MinorVersion Var="I1" Pos="0x1 (1)">0</MinorVersion> <PacketType Var="I1" Pos="0x2 (2)">RTS</PacketType> <PFCFlags Var="I1" Pos="0x3 (3)">FIRST_FRAG|LAST_FRAG</PFCFlags> <DataTypes> <Vars Var="I1" Pos="0x4 (4)">ASCII</Vars> <Float Var="I1" Pos="0x5 (5)">IEEE</Float> <Unused Var="I2" Pos="0x6 (6)">0</Unused> </DataTypes> <FragLen Var="I2" Pos="0x8 (8)">76</FragLen> <AuthLen Var="I2" Pos="0xA (10)">0</AuthLen> <CallId Var="I4" Pos="0xC (12)">0</CallId> <RTSFlags Var="I2" Pos="0x10 (16)">NONE</RTSFlags> <CmdCnt Var="I2" Pos="0x12 (18)">4</CmdCnt> <Cmds Var="" Pos="0x14 (20)"> <Cmd Var="I4" Pos="0x14 (20)">Version</Cmd> <Data Var="I4" Pos="0x18 (24)">1</Data> <Cmd Var="I4" Pos="0x1C (28)">Cookie</Cmd> <Data Var="A16" Pos="0x20 (32)">006b59eeb8f5cc1e446e46a337616ccd</Data> <Cmd Var="I4" Pos="0x30 (48)">Cookie</Cmd> <Data Var="A16" Pos="0x34 (52)">f8272562bd40b02d9d17f744959b0725</Data> <Cmd Var="I4" Pos="0x44 (68)">ReceiveWindowSize</Cmd> <Data Var="I4" Pos="0x48 (72)">65536</Data> </Cmds> </PDU> ``` This seems to be a `[MS-RPCH] 2.2.4.2 CONN/A1 RTS PDU` request. My PHP program is sending back a `[MS-RPCH]2.2.4.4 CONN/A3 RTS PDU`: ``` Response: HTTP/1.1 200 Success Content-Type: application/rpc Content-Length: 1000000000 Pragma: SessionId=7a6fca0d-d59b-4e54-8422-ef425c9e1132 Connection: Keep-Alive Cache-Control: private ``` Pseudo code: ``` <PDU> <!-- Converted binary data received from client --> <MajorVersion Var="I1" Pos="0x0 (0)">5</MajorVersion> <MinorVersion Var="I1" Pos="0x1 (1)">0</MinorVersion> <PacketType Var="I1" Pos="0x2 (2)">RTS</PacketType> <PFCFlags Var="I1" Pos="0x3 (3)">FIRST_FRAG|LAST_FRAG</PFCFlags> <DataTypes> <Vars Var="I1" Pos="0x4 (4)">ASCII</Vars> <Float Var="I1" Pos="0x5 (5)">IEEE</Float> <Unused Var="I2" Pos="0x6 (6)">0</Unused> </DataTypes> <FragLen Var="I2" Pos="0x8 (8)">28</FragLen> <AuthLen Var="I2" Pos="0xA (10)">0</AuthLen> <CallId Var="I4" Pos="0xC (12)">0</CallId> <RTSFlags Var="I2" Pos="0x10 (16)">NONE</RTSFlags> <CmdCnt Var="I2" Pos="0x12 (18)">1</CmdCnt> <Cmds Var="" Pos="0x14 (20)"> <Cmd Var="I4" Pos="0x14 (20)">ConnectionTimeout</Cmd> <Data Var="I4" Pos="0x18 (24)">14400000</Data> </Cmds> </PDU> ``` 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!