Server disconnecting missing

[Artos9]

Hello,
I’m working about Rapid Scada Integration with using ServerComm class in source code.

I had an issue with disconnecting with Scada Server only on Linux.

Process is:
1. Create comm settings.

CommSettings settings = new CommSettings("localhost", 10000,
                            "ScadaServerCtrl", "12345", 10000);
                            Log log = new Log(Log.Formats.Full);

2. Creating connection and data instance

ServerComm serverComm = new ServerComm(settings,log);
 SrezTableLight.Srez curSrez = new SrezTableLight.Srez(datetime,tab);

3. Fill data and SendArchive

curSrez.SetCnlData(mapping[j].channel_num,prob[j]);
bool dataSent = serverComm.SendArchive(curSrez, out res);

4. Close connection
serverComm.Close();

ScadaServerSvc.log shows log only connected and authorized logs:
2021-04-09 11:58:08 <kroll-VirtualBox><root><ACT> ScadaServerService 5.1.4.0 is started
2021-04-09 11:58:08 <kroll-VirtualBox><root><ACT> Module is loaded from the file /opt/scada/ScadaServer/Mod/ModAutoControl.dll
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Module is loaded from the file /opt/scada/ScadaServer/Mod/ModDBExport.dll
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Check the existence of the data directories is completed successfully
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Check the existence of the configuration database files is completed successfully
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Input channels are read from the configuration database. Active channel count: 211
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Ouput channels are read from the configuration database
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Users are read from the configuration database
2021-04-09 11:58:09 <kroll-VirtualBox><root><ACT> Formulas are read from the configuration database
2021-04-09 11:58:11 <kroll-VirtualBox><root><ACT> The formulas source code has been compiled
2021-04-09 11:58:11 <kroll-VirtualBox><root><ACT> Connection listener is started
2021-04-09 11:58:11 <kroll-VirtualBox><root><ACT> Start server
2021-04-09 11:58:11 <kroll-VirtualBox><root><ACT> Current data are not loaded
2021-04-09 11:58:20 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 11:58:20 <kroll-VirtualBox><root><ACT> The user ScadaComm is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> The user ScadaServerCtrl is successfully authenticated
2021-04-09 12:07:00 <kroll-VirtualBox><root><ACT> Connect to client 127.0.0.1

Finally after near 1000 opened connections I can see exception in code:
Error receiving data: Error connecting to SCADA-Server: Unable to read data from the transport connection: Operation on non-blocking socket would block.

Do you have some solutions?

Thanks you.

• This topic was modified 2 years, 5 months ago by Artos9.

[Mikhail]

Hello,

Probably 1000 connections is too many for Mono .NET framework. As I remember, an OS has a limit of open connections. It’s possible to find a command to change this limit.
For what reason do you need so many connections?

[Artos9]

Hello,
Yes, I change process for one connection. And it works well and faster.
Thanks you.

• This reply was modified 2 years, 5 months ago by Artos9.

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