# OPC UA without certificate

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [January 25, 2023, 7:36pm UTC](https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022 "2023-01-25T19:36:16Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![NII](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nii/32/12920_2.png) [@NII](https://forum.inductiveautomation.com/u/NII)\
**Post date:** [January 25, 2023, 7:36pm UTC](https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022/1 "2023-01-25T19:36:16Z")

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Is it possible to connect to OPC UA server without certificate?

I get connection 'faulted' when I try to.

Security mode = None  
Security policy = None

I also try disable (uncheck) - Security - Certificate Validation Enable, still faulted.

I am able to connect using uaexpert by accepting below:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/9/b957a0d44bbbb8e1bbbceff006114c37b26274d7.png)

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**Author:** ![nicoli.liedtke](https://avatars.discourse-cdn.com/v4/letter/n/ee59a6/32.png) [@nicoli.liedtke](https://forum.inductiveautomation.com/u/nicoli.liedtke)\
**Post date:** [January 25, 2023, 8:01pm UTC](https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022/2 "2023-01-25T20:01:35Z")

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Are you trying to connect to Ignition's default OPCUA Server?

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<div class="post-metadata">

**Author:** ![NII](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nii/32/12920_2.png) [@NII](https://forum.inductiveautomation.com/u/NII)\
**Post date:** [January 25, 2023, 8:09pm UTC](https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022/3 "2023-01-25T20:09:25Z")

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No, I am connecting to another server. Ignition will be the client.

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<div class="post-metadata">

**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\
**Post date:** [January 25, 2023, 9:22pm UTC](https://forum.inductiveautomation.com/t/opc-ua-without-certificate/69022/4 "2023-01-25T21:22:19Z")

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There's an advanced setting on OPC UA connections to disable certificate validation, you can give that a try.

The only configuration where certificates aren't checked at all (I think), is when you have no security _and_ are using an anonymous identity instead of username/password.