Hello!
Sometimes we have a problem with connection of a remote opcua client to our OPCUA Server.
To find out the reason of this problem, I enabled DatapointLogging.
Correct session looks like this:
13.11.2021 22:15:41.736 Session ID (0x7925b364) Client opens a session (CODE 1) Kepware_KEPServerEX_UA_Client_Driver:TnDruzhba user#3 0x00000000
14.11.2021 11:08:16.511 Session ID (0x7925b364) Client closes the session (CODE 2)
Client opened session and closed with the same Session ID. Everything is OK.
Uncorrect session:
17.11.2021 20:43:02.781 Server Shutdown (CODE 3)
17.11.2021 20:43:16.831 0x98a2c8a8 Client opens a session (CODE 1) urn:SMTNK27A:UnifiedAutomation:UaExpert user#1 0x00000000
17.11.2021 20:43:18.745 0x98a2c8a9 Client opens a session (CODE 1) urn:br-automation/BR/UA/EmbeddedServer user#2 0x00000000
17.11.2021 20:46:29.748 0x98a2c8ad Client opens a session (CODE 1) Kepware_KEPServerEX_UA_Client_Driver:TnDruzhba user#3 0x00000000
17.11.2021 20:53:21.615 0x98a2c8ad Client opens a session (CODE 1) Kepware_KEPServerEX_UA_Client_Driver:TnDruzhba user#3 0x00000000
17.11.2021 21:03:21.508 0x98a2c8ad Client opens a session (CODE 1) Kepware_KEPServerEX_UA_Client_Driver:TnDruzhba user#3 0x00000000
17.11.2021 21:03:36.316 0x98a2c8aa Client closes the session (CODE 2)
17.11.2021 21:04:30.954 0x98a2c8ab Client closes the session (CODE 2)
17.11.2021 21:05:25.646 0x98a2c8ac Client closes the session (CODE 2)
As you can see user named user#3 makes 3 sessions with the same Session ID and after a few seconds 3 messages with CODE 2 appear. But Session IDs (0x98a2c8aa, 0x98a2c8ab, 0x98a2c8ac) of CODE 2 were not connected to OPCUA server after reboot (there are only 0x98a2c8a8, 0x98a2c8a9, 0x98a2c8ad).
WinCC OA 3.17 P014.
Thanks in advance!
OPC UA connection problem
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