TCP communication failure
We use 5.1FP4 Revd. TCP communication is used between controllers and the status of TCPClientConnect block shows 5324 (Valid is False) as soon as the application is downloaded. We tried to check but couldnt get the cause as the configuration seems ok. Does anyone know probable reason?
Voted best answer
Firstly, ensure that there is no physical communication problem between the sender and receiver nodes (The nodes are able to see each other). sometimes, we have seen this issue when
- There is a network disruption that has been rectified and TCP communication doesnt automatically recover.
- When a cold download is done to a sender node, the communication between sender and receiver doesnt restart.
If cold download is possible, download the sender and receiver applications again. Ensure that the sender application is downloaded first and then receiver application is downloaded ( Order is important here).
Hope this helps.