# Ignition OPC UA Server Faulted(certificate path validation failed)

**URL:** <https://forum.inductiveautomation.com/t/ignition-opc-ua-server-faulted-certificate-path-validation-failed/90695>\
**Category:** Ignition\
**Created:** [May 21, 2024, 5:09pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-faulted-certificate-path-validation-failed/90695 "2024-05-21T17:09:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Mackenzie\_Lang](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@Mackenzie\_Lang](https://forum.inductiveautomation.com/u/Mackenzie_Lang)\
**Post date:** [May 21, 2024, 5:09pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-faulted-certificate-path-validation-failed/90695/1 "2024-05-21T17:09:33Z")

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Hello! I have been using the free trial of Ignition for a bit to get acclimated with it. Recently, my opc ua status reads as 'faulted', with the message reading: 'certificate path validation failed'

_UaException: status=Bad\_SecurityChecksFailed, message=certificate path validation failed_

I have tried some of the troubleshooting tips suggested when dealing with this issue but nothing seems to be working for me. Any help would be greatly appreciated!

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**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:** [May 21, 2024, 5:20pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-faulted-certificate-path-validation-failed/90695/2 "2024-05-21T17:20:04Z")

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If this is for the local/loopback connection and not to some other server then it probably means you, accidentally or otherwise, have more than one Ignition instance running, and Ignition A is connecting to the OPC server on Ignition B, which wouldn’t trust it by default.

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**Author:** ![Mackenzie\_Lang](https://avatars.discourse-cdn.com/v4/letter/m/73ab20/32.png) [@Mackenzie\_Lang](https://forum.inductiveautomation.com/u/Mackenzie_Lang)\
**Post date:** [May 21, 2024, 5:37pm UTC](https://forum.inductiveautomation.com/t/ignition-opc-ua-server-faulted-certificate-path-validation-failed/90695/4 "2024-05-21T17:37:18Z")

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Thanks for the quick response! Yes, it is the opc ua for the loopback connection. How would I go about double checking that there is only one instance running on the server? To my knowledge, I only have one instance of running as I have restarted my computer and ignition itself.