Kepserverex Device is not responding in EventLog

[KA_10164062]

My Kepserverex Modbus Ethernet  installed in Windows Server 2012 connected to around 15 plc using tcp communication. All the my plc giving device is not responding for every few minutes in eventlog. In OPC client the tag quality will change from good to bad once awhile(not all the tag in the device only few of it)

[VladimirN]

 Hi,

Read this article - "Error "Device is not responding" in event log in PTC Kepware Products": https://www.ptc.com/en/support/article/CS276466 

[KA_10164062]

I already try this. I didnt face this connection issue when i test it in windows 10 using demo version kepserverex during development stage. This issue only come when i run the kepserverex in my window server 2012. 

[KCorrigan · Accepted solution]

Hi KA,

I would check the following 2 things next, though with either of these I would expect no communication at all:

1. Explicit Congestion Notification

• When Explicit Congestion Notification (ECN) is enabled, some older devices will drop or reject the packets because of the manipulated header
  Disable ECN on the machine by:
  Launching a DOS command prompt by right-clicking and selecting Run as Administrator
  Type the following and then press Enter:
  ​netsh int tcp set global ecncapability=disabled
  Restart the computer

2. IF you saved and imported the project file from the another machine, you will want to check that the Network Adapters configured in the Channels/Devices in the KEPServerEX project are set to 'default' or one on this new machine instead of being bound to the NIC of the old machine still.

Another thought:

Since you are getting good comms occasionally, please make sure each of the 15 devices are on their own individual channel in KEPServerEX.

If none of these is the issue, please open a technical support case so we can get more details and files from you.

Thanks,

KC