# OPC UA Connection Issues

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-connection-issues/115711>\
**Category:** Ignition\
**Created:** [May 26, 2026, 6:17pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-issues/115711 "2026-05-26T18:17:19Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![Slick](https://avatars.discourse-cdn.com/v4/letter/s/53a042/32.png) [@Slick](https://forum.inductiveautomation.com/u/Slick)\
**Post date:** [May 26, 2026, 6:17pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-issues/115711/1 "2026-05-26T18:17:19Z")

</div>

Hello,

I have a device connected to two Ignition gateways through OPC UA.

On one gateway the connection is fine and has been up for a bit now.

On the other gateway however, the connection is faulted I am getting these errors from the log:

```python
Failed to create subscription 'xyz': null

```

`subscriptionName=xyz ignSubscription=com.inductiveautomation.ignition.gateway.opcua.client.connection.OpcUaSubscriptionModel$IgnitionSubscription@63b1dfa1, opcSubscription=null`

Additionally, the fault message is so:

```python
java.lang.Exception: session inactive: id=NodeId{ns=1, id=00000000-0000-0040-8000-000000000000} name=ignition[Ignition-xyz]_xyz_1779711986139
	at com.inductiveautomation.ignition.gateway.opcua.client.connection.OpcUaConnection$MiloSessionActivityListener.onSessionInactive(OpcUaConnection.kt:499)
	at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$null$39(SessionFsmFactory.java:611)
	at java.base/java.util.concurrent.CopyOnWriteArrayList.forEach(Unknown Source)
	at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$configureActiveState$40(SessionFsmFactory.java:611)
	at com.digitalpetri.strictmachine.dsl.ActionBuilder$PredicatedTransitionAction.execute(ActionBuilder.java:119)
	at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.lambda$run$0(StrictMachine.java:242)
	at java.base/java.util.ArrayList.forEach(Unknown Source)
	at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.run(StrictMachine.java:227)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)

```

I've experienced connection faults before with this device model and usually when they occur it's on both gateways. A quick fix I've found is doing a power cycle on the device, but this time it didn't seem to work for both gateways.

Any recommendations what could be causing this and how I would go about resolving it permanently, so I don't have to rely on power cycles?