# OPC UA certificate error

**URL:** <https://discourse.nodered.org/t/opc-ua-certificate-error/59111>\
**Category:** General\
**Created:** [28 February 2022 11:23 UTC](https://discourse.nodered.org/t/opc-ua-certificate-error/59111 "2022-02-28T11:23:06Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rizwan](https://avatars.discourse-cdn.com/v4/letter/r/bcef8e/32.png) [@rizwan](https://discourse.nodered.org/u/rizwan)\
**Post date:** [28 February 2022 11:23 UTC](https://discourse.nodered.org/t/opc-ua-certificate-error/59111/1 "2022-02-28T11:23:06Z")

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Hello guys,

I am a beginner in node-red and trying to read data from OPCUA server via opc ua client node but I am getting an error of "invalid endpoint error: The connection may have been rejected by server".

 ![Screenshot from 2022-02-28 13-21-12](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/b/8/b8cbdcd9c86c1f4e2ac414a851b8d05b224cc5e3.png)

As I try to activate this node by debug button suddenly my node red software stops working and there is a message of opcua certificate manager problem at the terminal.

 ![Screenshot from 2022-02-28 13-22-24](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/7/6/76b2db4e8d6a2cf0dd04266785c1400c2aa67c78.png)

Guys, I need some senior guidance, I will be thankful for any lead.

Kind regards,  
Muhammad Rizwan Kamleen

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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:** [29 April 2022 11:23 UTC](https://discourse.nodered.org/t/opc-ua-certificate-error/59111/2 "2022-04-29T11:23:33Z")

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