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Connecting to a PLC with anonymous users turned off

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25 Nov 2025 16:16 #14490 by Cwardltu
Replied by Cwardltu on topic Connecting to a PLC with anonymous users turned off
kep : 6.7.1046.0
opcLabs: 5.82.423

It consistently connects and reconnects within roughly 1 or 2 seconds. the log i posted is and example of 1 cycle of a disconnection and reconnection.

Were you able to reproduce with the code I provided? Can you share what your log displays?

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25 Nov 2025 15:55 #14489 by support
Replied by support on topic Connecting to a PLC with anonymous users turned off
What do you mean by "it connects then disconnects. the connection is never maintained. ". Are you saying that your code stops getting data all by itself, without you doing Reinitialize on the server side? If so, how often does that happen? Is that random, or regular?

Regards
 

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25 Nov 2025 15:43 #14488 by support
Replied by support on topic Connecting to a PLC with anonymous users turned off
Which version of QuickOPCm and of KepServerEX, are you using please?

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25 Nov 2025 13:23 #14487 by Cwardltu
Replied by Cwardltu on topic Connecting to a PLC with anonymous users turned off
Yes, it connects then disconnects. the connection is never maintained. 

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25 Nov 2025 10:21 - 25 Nov 2025 10:21 #14486 by support
Replied by support on topic Connecting to a PLC with anonymous users turned off
Hello.

But I can see in your screenshot that around 11:55:49.286, you start getting data updates again, and therefore the client has successfully reconnected.

But - maybe - you are complaining about the fact that the lines before, which come from the connection monitoring service, end with "Connected" state with a failure indication. Is that what you mean by saying that the reconnect has failed?

Best regards
 
Last edit: 25 Nov 2025 10:21 by support.

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24 Nov 2025 16:59 #14485 by Cwardltu
Replied by Cwardltu on topic Connecting to a PLC with anonymous users turned off
Here is the behavior I am observing. the expectation is that it would reconnect and hold on to that connection.
Attachments:

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24 Nov 2025 16:53 #14484 by Cwardltu
Replied by Cwardltu on topic Connecting to a PLC with anonymous users turned off
No from my end i am running the happy path. allow anon user turned on. I connect initially. i reinitialize. then it does not allow the reconnect..

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24 Nov 2025 16:51 #14483 by support
Replied by support on topic Connecting to a PLC with anonymous users turned off
I am sorry but I do not understand you.

Are you getting the same results as I reported?
If so, do you expect a different behavior from the software, and what is the behavior you expect?

Note that in my test, when the anonymous logon is disabled in Kepware, I can *not* connect initially. Is that a difference from your observations? 

Regards
 

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24 Nov 2025 16:47 #14482 by Cwardltu
Replied by Cwardltu on topic Connecting to a PLC with anonymous users turned off
Yes I found that when i disallowed anon user i would get the same result. Why is that intended. is reconnect not allowed at a anon user?

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24 Nov 2025 16:45 - 24 Nov 2025 16:46 #14481 by support
Replied by support on topic Connecting to a PLC with anonymous users turned off
Hello.
I am confused here. The repro class you sent does not contain any username/password authentication from the client side.

When I run it as is, with "Allow anonymous login" in Kepware turned on, it successfuly connects, and after Reinitialize, it successfuly reconnects, which is expected.
When I run it as is, with "Allow anonymous login" in Kepware turned off, it always fails to connect (with BadUserAccessDenied), which is also expected.

Best regards

 
Last edit: 24 Nov 2025 16:46 by support.

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