# OPC Server not connecting

**URL:** <https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711>\
**Category:** Ignition\
**Created:** [May 24, 2016, 2:43am UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711 "2016-05-24T02:43:15Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![weertske](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/weertske/32/3353_2.png) [@weertske](https://forum.inductiveautomation.com/u/weertske)\
**Post date:** [May 24, 2016, 2:43am UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/1 "2016-05-24T02:43:15Z")

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I had a problem similar to the topic: [quote]Cannot browse connection “Ignition OPC-UA server” [/quote]I am running version 7.8.2 on a Linux machine running Oracle Java 8\_91 with the MES modules installed. The solution was the same, reset the endpoints.

You probably need to look into a fix before you get further complaints.

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**Author:** ![anna](https://avatars.discourse-cdn.com/v4/letter/a/779978/32.png) [@anna](https://forum.inductiveautomation.com/u/anna)\
**Post date:** [June 15, 2016, 11:43pm UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/2 "2016-06-15T23:43:52Z")

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weertske, when you say you had to reset endpoints, what exactly do you mean?  
Also, did your Gateway’s IP address change? Typically, you will see a previously working connection fault when the machine running the Gateway receives a new IP address, making previous security certificates invalid.  
To avoid this issue in production, Ignition Gateway should be run on a server with a static IP address.

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<div class="post-metadata">

**Author:** ![weertske](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/weertske/32/3353_2.png) [@weertske](https://forum.inductiveautomation.com/u/weertske)\
**Post date:** [June 16, 2016, 4:07am UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/3 "2016-06-16T04:07:54Z")

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My server’s IP address is static. However, I installed the Ignition MES gwbk so maybe it is the problem.

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**Author:** ![anna](https://avatars.discourse-cdn.com/v4/letter/a/779978/32.png) [@anna](https://forum.inductiveautomation.com/u/anna)\
**Post date:** [June 16, 2016, 3:29pm UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/4 "2016-06-16T15:29:36Z")

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It could be - not necessarily because of MES modules, but as consequence of restoring from a Gateway backup. The restore overwrites configuration, including the endpoint in OPC settings.

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<div class="post-metadata">

**Author:** ![weertske](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/weertske/32/3353_2.png) [@weertske](https://forum.inductiveautomation.com/u/weertske)\
**Post date:** [June 16, 2016, 6:30pm UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/5 "2016-06-16T18:30:05Z")

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That is what I thought.

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<div class="post-metadata">

**Author:** ![bfeas](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bfeas/32/3783_2.png) [@bfeas](https://forum.inductiveautomation.com/u/bfeas)\
**Post date:** [April 12, 2019, 1:22pm UTC](https://forum.inductiveautomation.com/t/opc-server-not-connecting/11711/6 "2019-04-12T13:22:06Z")

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Was there any resolution to this?  
We are now experiencing OPC-UA not connecting.  
version 7.9.10  
We setup a redundancy gateway for testing and now the master seems to be stuck in ‘Connecting’ status.  
We removed redundancy and restarted but no luck.