# OPC UA Server Faulting on startup

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-server-faulting-on-startup/113046>\
**Category:** Ignition\
**Tags:** perspective, ignition81\
**Created:** [January 2, 2026, 2:00pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-faulting-on-startup/113046 "2026-01-02T14:00:16Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![derek.stoddard](https://avatars.discourse-cdn.com/v4/letter/d/7993a0/32.png) [@derek.stoddard](https://forum.inductiveautomation.com/u/derek.stoddard)\
**Post date:** [January 2, 2026, 2:00pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-faulting-on-startup/113046/1 "2026-01-02T14:00:16Z")

</div>

Hi all,

The last two days I have been experiencing an issue where the OPC UA server faults when I first start up my computer. I have been able to fix this by stopping the Ignition Gateway service, renaming the “opcua” folder found in **C:\Program Files\Inductive Automation\Ignition\data** to “opcua\_old” and restarting the service. The error message from the logs is attached. Any ideas?

Thanks

edit: looks like the image may be too small to read, here is the error:

INFO | jvm 1 | 2026/01/02 08:41:54 | E [o.e.m.o.s.c.t.u.UascClientAcknowledgeHandler] [08:41:54.459]: [remote=localhost/127.0.0.1:62541] Received error message: ErrorMessage{error=StatusCode{name=Bad\_SecurityChecksFailed, value=0x80130000, quality=bad}, reason=status=Bad\_SecurityChecksFailed, description=An error occurred verifying security.}

![opcUAServerFault](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/8/787c12e90ec5375bd6df55b6d7ec23e694a1250e.png)

---

<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 2, 2026, 2:44pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-faulting-on-startup/113046/2 "2026-01-02T14:44:05Z")

</div>

Hard to say without log files and version info, but it seems that one side doesn't trust the other side's certificate for some reason. Maybe one expired, maybe the UUID got deleted and now the URIs don't match up, not sure.