# OPC connection faulted returns Bad\_CertificateUriInvalid

**URL:** <https://forum.inductiveautomation.com/t/opc-connection-faulted-returns-bad-certificateuriinvalid/81643>\
**Category:** Ignition\
**Created:** [November 8, 2023, 7:28am UTC](https://forum.inductiveautomation.com/t/opc-connection-faulted-returns-bad-certificateuriinvalid/81643 "2023-11-08T07:28:28Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![PandaChen\_C](https://avatars.discourse-cdn.com/v4/letter/p/5f8ce5/32.png) [@PandaChen\_C](https://forum.inductiveautomation.com/u/PandaChen_C)\
**Post date:** [November 8, 2023, 7:28am UTC](https://forum.inductiveautomation.com/t/opc-connection-faulted-returns-bad-certificateuriinvalid/81643/1 "2023-11-08T07:28:28Z")

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I have a BOX2 PRO communication module that supports OPC UA. When using UAexpert, I can connect and read data, but when creating an OPC connection using Ignition, I cannot connect. The error message indicates 'status=Bad\_CertificateUriInvalid, description=The URI specified in the ApplicationDescription does not match the URI in the Certificate'

image steps:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/c/ec2ad3195db240835c304f7bd9c393a9eaf4166e.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/e/6ed0201a09bd83c011b6db4d226519cbce94f940.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/d/4d453694ec5a5b3f0c38ce2045f94089ca42085b.png)

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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:** [November 8, 2023, 12:03pm UTC](https://forum.inductiveautomation.com/t/opc-connection-faulted-returns-bad-certificateuriinvalid/81643/2 "2023-11-08T12:03:36Z")

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What version of Ignition are you using?

edit: nevermind, I see it's 8.1.7 in the screenshot.

It's possible the problem is exactly what the error says: the URI in the certificate does not match the one returned by the GetEndpoints service. You will need to get a Wireshark capture to verify.