Hello.

The two operations certainly aren't the same.

In the WireShark capture taken with QuickOPC, you are writing an array of 33 Booleans.
In the WireShark capture taken with UAExpert (packet 421), you are writing a single Boolean.

Also, contrary to your claim, the NodeId is different. With QuickOPC, it was "ns=3; i=3911". With UAExpert, it was "ns=3; i=3861".

Regards

Hello.
It can be seen that right after the WriteRequest (packet 223), the server abruptly closes the TCP connection (packet 225).



I do not see anything wrong with the WriteRequest, and even if it were wrong, the server should not react in this way.



To me, this looks like a server bug, until proven otherwise. Send this analysis to the server vendor and ask them to fix it.

We can also ponder about why another client had worked, and try to find the differences and a possible workaround. If you want to pursue this way, send me the WireShark capture of the same operation (same node, same data, ...) from that other client.

Best regards

Hello.

The page link I have provided (kb.opclabs.com/Collecting_information_for_troubleshooting ) contained two more links with WireShark instructions:
- opcconnect.opcfoundation.org/2017/02/analyzing-opc-ua-communications-with-wireshark/
- www.prosysopc.com/blog/opc-ua-wireshark/

You can post the data here (zipped, if it's too long).

Thank you

Thank you.

One more question, are you able to write the same using some other client? (such as UAExpert?)

If so, I tend to say that for whatever reason, the server disconnects upon the Write request. It is difficult to tell more without knowing the actual communication. Would you be able and willing to capture the communication using Wireshark? (ideally also with another client that works).

kb.opclabs.com/Collecting_information_for_troubleshooting

Regards

Hello,

can you give some more information?

1. With this particular operation, does it happen always, often, or rarely?
2. Are you able to do other operations (such as reading, or writing to other items) on the same server (using QuickOPC?)
3. What data type are you attempting to write?

Thank you