# My OPCUA node suddenly don't work with the “End point must exist opc.tcp://GCS:4862” issue

**URL:** https://discourse.nodered.org/t/my-opcua-node-suddenly-dont-work-with-the-end-point-must-exist-opc-tcp-gcs-4862-issue/51495
**Category:** General
**Created:** [25 September 2021 04:17 UTC](https://discourse.nodered.org/t/my-opcua-node-suddenly-dont-work-with-the-end-point-must-exist-opc-tcp-gcs-4862-issue/51495 "2021-09-25T04:17:09Z")
**Posts on this page:** 2
**Page:** 1

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### Author: ![Thormagol](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/thormagol/32/48606_2.png) [@Thormagol](https://discourse.nodered.org/u/Thormagol)
#### Post date: [25 September 2021 04:17 UTC](https://discourse.nodered.org/t/my-opcua-node-suddenly-dont-work-with-the-end-point-must-exist-opc-tcp-gcs-4862-issue/51495/1 "2021-09-25T04:17:09Z")

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I use the _node-red-contrib-opcua_ node to connect the WinCC OPCUA， it works just fine until last night the Windows get itself updated. This morning I start my flows and find my node can`t connect the Wincc OPC UA .

the error shows like below:

```auto
25 Sep 11:53:11 - [error] [OpcUa-Client:Wincc for OPC] Client node error on: Wincc for OPC error: ["Wincc for OPC OPC UA connection error: End point must exist opc.tcp://GCS:4862"]
Client node error on: Wincc for OPC error: ["Wincc for OPC OPC UA connection error: End point must exist opc.tcp://GCS:4862"]

```

This is my situation：

1. I build a local WinCC project to run the OPCUA，I started the WinCC project， and I can connect the OPC from UAExpert  
 ![1](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/2/a20320d42ff93ba1cdd4ad270f8489c02119d047.jpeg)
2. But in the Node-Red I just can connect the OPC  
 ![2](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/2/b225c9d8e37ec927dcac7d030dfb0f5f4c3e1e1b.png)
3. I used the PING node link the debug node ，and it returned "1"

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<div class="post-metadata">

### Author: ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)
#### Post date: [24 November 2021 04:18 UTC](https://discourse.nodered.org/t/my-opcua-node-suddenly-dont-work-with-the-end-point-must-exist-opc-tcp-gcs-4862-issue/51495/2 "2021-11-24T04:18:00Z")

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