# OPC Quick Client not finding connected controller

**URL:** <https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468>\
**Category:** General Discussion\
**Created:** [February 27, 2024, 9:45pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468 "2024-02-27T21:45:47Z")\
**Posts on this page:** 9\
**Page:** 1

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**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 9:45pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/1 "2024-02-27T21:45:47Z")

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I'm new to ignition and I'm having a problem seeing tags from a newly connected Allen Bradley CompacLogix. The PLC is connected, but the OPC quick client is not showing any connections:

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/b/a/babe0555853f3becb28fd896ea5b00d9303fff45.png)

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/8/c8dca536268be4c975fb5e9b34341ebeeb9c1748.png)

Any ideas?  
Thanks!

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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:** [February 27, 2024, 9:46pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/2 "2024-02-27T21:46:48Z")

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You don't appear to have an OPC connection to Ignition's own OPC UA server defined.

This is configured by default in a fresh install, so it must have been deleted by somebody.

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 9:47pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/3 "2024-02-27T21:47:52Z")

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That is definitely possible. Can you tell me how to recreate this?

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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:** [February 27, 2024, 9:48pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/4 "2024-02-27T21:48:15Z")

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> **[OPC UA Client Connection Settings | Ignition User Manual](https://docs.inductiveautomation.com/docs/8.1/ignition-modules/opc-ua/opc-ua-client-connection-settings#configuring-an-opc-client-connection)**
>
> Configuring an OPC Client Connection

You'll use the discovery/endpoint URL `opc.tcp://localhost:62541/discovery`.

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 9:48pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/5 "2024-02-27T21:48:53Z")

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great - i will give that a try

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 9:54pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/6 "2024-02-27T21:54:10Z")

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The ignition OPC UA server was restored but it is in a faulted state

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 10:07pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/7 "2024-02-27T22:07:49Z")

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![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/4/6441310a975d9de00c5245490acb0ad8b07d5fcb.png)

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 10:14pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/8 "2024-02-27T22:14:40Z")

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I do not have permission to configure the OPC UA server (?):  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/e/defc47b2df8d69be3faf8ccf5671c749b87423dd.png)

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<div class="post-metadata">

**Author:** ![Sam\_Reed](https://avatars.discourse-cdn.com/v4/letter/s/977dab/32.png) [@Sam\_Reed](https://forum.inductiveautomation.com/u/Sam_Reed)\
**Post date:** [February 27, 2024, 10:28pm UTC](https://forum.inductiveautomation.com/t/opc-quick-client-not-finding-connected-controller/86468/9 "2024-02-27T22:28:22Z")

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I had a Gateway backup that I was able to restore - the OPC UA Server is working again.  
Thanks for your help!