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Prosys OPC UA Simulation Server and Prosys OPC UA Client
May 30, 2020
15:34, EEST
Forum Posts: 4
Member Since:
May 30, 2020
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I’m trying to create OPC UA Connection between these two app.
To be more specific, I have 2 devices. The 1st device runs Prosys OPC UA Simulation Server, the connection address is:
Still in the 1st device, I go to to command prompt -> ipconfig, and check that the IPV4 address is
The 2nd device runs Prosys OPC UA Client, and I write the address: opc.tpc://
But the Server and Client only connect when the 2nd device join the same network as 1st device. While they are connecting to different network, the is an error:
“Could not connect to the server:
Error=Cannot discover applications from ocp.tcp://″

Can you tell me if I do something wrong? And please give me some way to fix it if possible.
Also, actually the problem happens with other OPC UA server-client application, not just with Prosys.
Thank you

June 1, 2020
10:34, EEST
Bjarne Boström
Forum Posts: 836
Member Since:
April 3, 2012
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The opc.tcp protocol works like any other tcp (https://en.wikipedia.org/wiki/Transmission_Control_Protocol) protocol network-wise, there isn’t anything special about that.

Generally it should be noted that these kinds of questions fall somewhat under basic networking know-how that you should just already know (or be willing to learn by yourself) and thus outside scope of this forum. We do offer professional services (e.g. consulting): https://www.prosysopc.com/services/.

But that being said, you can study and try these, as a rule of thumb the machine connecting must see the other machine it is to connect.

– Your IP range is https://en.wikipedia.org/wiki/Private_network, thus connections from https://en.wikipedia.org/wiki/Wide_area_network does not work obiviously unless your (most likely router’s) https://en.wikipedia.org/wiki/Network_address_translation forward it properly
– Also e.g. Windows 10 might https://en.wikipedia.org/wiki/Domain_Name_System the hostname to https://en.wikipedia.org/wiki/IPv6 (usually only a https://en.wikipedia.org/wiki/Localhost problem if a server does not bind to IPv6 localhost and you use the hostname to connect)
– See if you can https://en.wikipedia.org/wiki/Ping_(networking_utility) the other machine from the other, but it is not necessary nor it might give direct indication that connecting with UA would work

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