Communicator error “unable to read data packet header”

[OPCUser]

Hi Mikhail,

i ran into a problem today. Communicator stopped working
all of a sudden giving me the error: “Error checking server connection:
Incorrect format of data received from the server: unable to read data packet header”

Here is the communicator log:

——————————————————————————–
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Communicator 6.2.0.0 started
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Storage FileStorage 6.2.0.0 loaded from file C:\Program Files\SCADA\ScadaComm\FileStorage.dll
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Start logic processing
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Driver DrvDsOpcUaServer 6.0.0.2 loaded from file C:\Program Files\SCADA\ScadaComm\Drv\DrvDsOpcUaServer.Logic.dll
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Driver DrvDsScadaServer 6.0.1.1 loaded from file C:\Program Files\SCADA\ScadaComm\Drv\DrvDsScadaServer.Logic.dll
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Driver DrvOpcClassic 6.0.1.2 loaded from file C:\Program Files\SCADA\ScadaComm\Drv\DrvOpcClassic.Logic.dll
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Data source ScadaServer initialized successfully
2024-09-05 15:47:44 [OPC-WINCC][OPCSrv][ACT] Data source OpcUaServer initialized successfully
2024-09-05 15:47:45 [OPC-WINCC][OPCSrv][ACT] Data source ScadaServer: Receive the configuration database
2024-09-05 15:47:47 [OPC-WINCC][OPCSrv][ERR] Data source ScadaServer: Error checking server connection:
Incorrect format of data received from the server: unable to read data packet header
2024-09-05 15:47:47 [OPC-WINCC][OPCSrv][ERR] Unable to start communication lines because the configuration database is not received
2024-09-05 15:47:49 [OPC-WINCC][OPCSrv][ACT] Stop communication lines
2024-09-05 15:47:49 [OPC-WINCC][OPCSrv][ACT] All communication lines are stopped
2024-09-05 15:47:49 [OPC-WINCC][OPCSrv][ACT] Logic processing is stopped
2024-09-05 15:47:49 [OPC-WINCC][OPCSrv][ACT] Communicator is stopped
——————————————————————————–

Can you point me to where the problem is?

Thanks in advance.

David

[Mikhail]

Hi,

A possible reason is that TCP port 10000 has started to be used by another application, not the Server app.

[OPCUser]

Hi there,

you were right, i had added influxDB as a datasource to grafana on the machine thats running RapidSCADA and Grafana.
I changed the port of Server and Communicator to 10003 (10001 and 10002 wasnt working for me) and then it was fine again.

Thank you,

David

[Mikhail]

Hi,

That’s good.
I suggest TCP View utility to check all ports in use.

[Author]

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