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  5. QuickOPC-Classic in .NET
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  9. 0x80040202 (CONNECT_E_CANNOTCONNECT ?)

0x80040202 (CONNECT_E_CANNOTCONNECT ?)

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14 Jul 2017 08:16 #5351 by support
Replied by support on topic 0x80040202 (CONNECT_E_CANNOTCONNECT ?)
Besides tweaking these settings (and possibly tweaking DCOM too), I cannot think of further options. The difference between other OPC client(s) and ours in this respect is usually in the fact that ours is .NET-based, and .NET host may do its own COM initialization which conflicts with what we want, for which all these extra settings exist.

CONNECT_E_CANNOTCONNECT is related to the "reverse" direction, when the server attempts to set up a callback to the client (for subscriptions). Sync reads/writes will probably work well.

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13 Jul 2017 12:22 - 13 Jul 2017 12:25 #5350 by chrisbonnar
Replied by chrisbonnar on topic 0x80040202 (CONNECT_E_CANNOTCONNECT ?)
I tried all combinations.

UseCustomSecurity = false alone made no difference.
UseCustomSecurity = false + TurnOffActivitionSecurity = true resulted in a different error - "access denied". This may be a step forward? But I am still stuck.

This is a windows application, both debugging in Visual Studio and running the compiled exe is done under the identity of the current user - which is known to definitely have read/write access on the Kepware server. Running Visual Studio as administrator also made no difference.

Please advise.
Last edit: 13 Jul 2017 12:25 by chrisbonnar. Reason: added note about identities

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13 Jul 2017 08:21 #5347 by support
Replied by support on topic 0x80040202 (CONNECT_E_CANNOTCONNECT ?)
Hello,

can you please try different combinations of parameters as described here: www.opclabs.com/forum/connections-reconnections-com-dcom/124...ng-to-remote-machines-via-code .

Regards

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12 Jul 2017 11:10 #5346 by chrisbonnar
0x80040202 (CONNECT_E_CANNOTCONNECT ?) was created by chrisbonnar
Please see attached screenshot. I am trying to subscribe to a Kepware tag on a customer's remote server from my .NET windows application and I get a very unhelpful and non-descriptive error 0x80040202 in return.

On advice of an OPC Training Institute article I have run the OPC Expert utility on the same computer, and it can subscribe to the tag without issue.

Please advise.
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  1. Forum
  3. Discussions
  5. QuickOPC-Classic in .NET
  7. Reading, Writing, Subscriptions, Property Access
  9. 0x80040202 (CONNECT_E_CANNOTCONNECT ?)
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