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OPC XML-DA. There are many sockets open in subscription mode

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15 Oct 2019 09:18 #7828 by support
Hello.
Please download and rebuild with the latest QuickOPC 2019.1, build 422.1 or later, as on our Web page and NuGet.

There is now a new setting for this, called HttpClientConnectionLimit, in EasyDAAdaptableParameters. Allows setting the maximum number of HTTP client connections used in OPC XML-DA. Works in .NET Framework. Works partially in .NET Core - only when authentication is not used.

Should be set just once, before the operations begin. If yours EasyDAClient.Isolated is 'false' (the default), the value from static EasyDAClient.AdaptableParameters.HttpClientConnectionLimit will be used. If yours EasyDAClient.Isolated is 'true', the value from that instance's EasyDAClient.IsolatedParameters.HttpClientConnectionLimit will be used.


The parameter defaults to 20, you can try changing it to 2 or so.

Best regards

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11 Oct 2019 07:08 #7818 by Andriy

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10 Oct 2019 14:45 #7817 by support
This is just to let you know that we are working on this - and other - issues you have reported. Please be patient... it will be coming.
Are you targeting .NET Framework or .NET Core?

Best regards

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03 Oct 2019 13:43 #7793 by support
Thank you for splitting the thread. Link to the original thread: www.opclabs.com/forum/reading-writing-subscriptions-property...s-not-specify-a-timestamp#7787 .

I will reply here when I have more information.

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03 Oct 2019 10:30 #7788 by Andriy
Hello,

Vendor info:
Nordex OPC XML-DA Gateway

The number of open sockets ramping up to 20 + 12 in "time wait" state and is stable.
They open and close very often

Best regards

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