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Reference Client (UA.-.NETStandard-master) is BadNotConnected
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10/15/2020 - 01:16
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Hello Everybody!

I have a question that I already asked on the GitHub forum and stackoverflow forum. Unfortunately no one could help me in the two forums. Maybe someone here has had a similar problem before. 

If I do get an answer in the GitHub forum or stackoverflow forum, I'll name it here. My GitHubPost can be found under the following link:

I will still copy the post from the GitHub forum here if the link no longer works at some point.

I downloaded the OPC UA standard project from github ( I would like to use the Reference Client there to access a Beckhoff PLC (server). To do this, I opened the project in VS2017 and set the Reference Client as the startup project. Then I started the project with F5. The following window opened:

MFE1o.pngImage Enlarger

If I now specify the IP address and the port of my PLC (as shown above) and then click on "Connect", the client sometimes establishes a connection to the PLC and sometimes I get the following error message:

njGBF.pngImage Enlarger

In about 80% of the cases there is this error message and the client does not connect to the server. In about 20% of the cases a connection to the server is established and I can read and write variables from the server. I didn't change the program and it seems completely arbitrary when the connection can be established and when not. Has anyone ever had a similar problem?

I am using the current versions of VS2017, Windows 10 and OPC UA project.

Many thanks in advance.

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