# Node Red as opc ua client(IOT2050) to WinCC RT Unified V18 OPCUA Server

**URL:** <https://discourse.nodered.org/t/node-red-as-opc-ua-client-iot2050-to-wincc-rt-unified-v18-opcua-server/96732>\
**Category:** General\
**Created:** [24 April 2025 01:23 UTC](https://discourse.nodered.org/t/node-red-as-opc-ua-client-iot2050-to-wincc-rt-unified-v18-opcua-server/96732 "2025-04-24T01:23:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![dinesh](https://avatars.discourse-cdn.com/v4/letter/d/a8b319/32.png) [@dinesh](https://discourse.nodered.org/u/dinesh)\
**Post date:** [24 April 2025 01:23 UTC](https://discourse.nodered.org/t/node-red-as-opc-ua-client-iot2050-to-wincc-rt-unified-v18-opcua-server/96732/1 "2025-04-24T01:23:22Z")

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I’m trying to set up my node red(node js version 18 and node red v3.0.2) as a opc ua client to WinCC Unified RT V18 OPCUA Server. however, it is giving invalid endpoint error (node-red-contrib-opcua-0.2.339).

I initially tested with UaExpert Opcua client to the Wincc opcua server. and I was able establish communication.

I suspect this has something to do with certificate because I struggled with UAExpert client on this. It did not automatically get generated in the rejected or trusted cert folder(in WinCC path). I had to manually transfer it from UaExpert ceritficate menu/folder. I'm not sure how to do this in a nodered setup?

Please assist. Thank you

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/d/0d7f52d07b07864001898ce184ba9c8e51136bb1.png)

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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:** [23 July 2025 01:24 UTC](https://discourse.nodered.org/t/node-red-as-opc-ua-client-iot2050-to-wincc-rt-unified-v18-opcua-server/96732/2 "2025-07-23T01:24:17Z")

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