# Problem with Flow with OPCUA Server

**URL:** <https://discourse.nodered.org/t/problem-with-flow-with-opcua-server/82533>\
**Category:** General\
**Tags:** opcua\
**Created:** [1 November 2023 20:54 UTC](https://discourse.nodered.org/t/problem-with-flow-with-opcua-server/82533 "2023-11-01T20:54:39Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Ahmaad](https://avatars.discourse-cdn.com/v4/letter/a/5e9695/32.png) [@Ahmaad](https://discourse.nodered.org/u/Ahmaad)\
**Post date:** [1 November 2023 20:54 UTC](https://discourse.nodered.org/t/problem-with-flow-with-opcua-server/82533/1 "2023-11-01T20:54:39Z")

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Hello everyone,  
I have a problem with building an OPC UA server.  
I have built a flow where I use an OPC UA server. Everything worked great. I recently checked again and then I see that nothing works anymore.  
Node-Red runs on a server. All necessary palettes are added.

I then deleted my flows and added an example flow from the library and tried it out. Unfortunately, this example doesn't work either. (see image)

I use UA-Expert to check the connection.  
Picture 1:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/d/f/dff17b21c0ab2199d635c1383031c23ace71f69b.png)

The problem is that I can't see the structure that the OPC UA server is supposed to build.  
I took an example flow here and I can't see anything when testing with UA-Expert even though everything is written under "Address Space".

Also, I keep losing connection when I move any node and then press "Deploy".

Additionally I see the following under Logs:  
Picture 2:

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/b/0bc769af32b8b2cd0aefc49d9a85479b2eddb1be.jpeg)

I completely uninstalled Node-Red and reinstalled it, but unfortunately the problem is still there.

Best regards,  
Ahmad

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [31 December 2023 20:55 UTC](https://discourse.nodered.org/t/problem-with-flow-with-opcua-server/82533/2 "2023-12-31T20:55:35Z")

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