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OPC UA Web App Unable to Recognize License - by: gkalipershad

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Hello,

I have been working with a customer that has an OPC Data Client Professional Edition license.

The are using the following:

- OPC Data Client 2020.3 (5.59.492.1)
- Windows Server 2019 Datacenter Version 1809
- .NET Core 3.1.0

Whenever they run their Web App that is hosted on IIS, they get the following error after 30 minutes:

"Run time is over the limit in license "Multipurpose", serial number 1111111120. The license you are running (most likely trial version) does not provide valid data after certain time period expires. Note that after the component's process is simply restarted, valid data will be provided again. Obtain and install proper license to permanently resolve this error. Product information follows. Component name: "QuickOPC", license IDs: "Multipurpose", version number: 559, release date: 12/3/2020, trial validity: 397 days, option expression: "EasyUAClient". Context: 0 dropped license(s). + The client method called was 'DataChangeNotification'."

Here are some things I have already looked for:

- This does happen on both the development machine and when deployed to IIS.
- The license was applied through the License Manager and not through any other methods.
- The correct 'QuickOpc' component was licensed.
- The Release date covered is 2/9/2022, so all good there.
- The EasyOpcUADemo runs fine and does not encounter license error after 30min.

I had believed this issue was related to the "Access to the License" section here: softwaretoolbox.doc-that.com/files/onlinedocs/OpcDataClient/...bframe.html#License_Store.html

We had them show us what user the Application Pool was running under and then we had them go into the registry and confirm that the user account had read access to HKEY_LOCAL_MACHINE\SOFTWARE\Licensing\QuickOPC\Multipurpose.

I'm afraid that after all that, I am out of ideas. Hoping you could provide some input that might get us going in the right direction.

Thanks,
GK

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