# OPC-UA Fault - not a known server type

**URL:** <https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146>\
**Category:** Ignition\
**Tags:** opcua\
**Created:** [June 20, 2024, 9:50am UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146 "2024-06-20T09:50:34Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Ole\_Christian\_Marti](https://avatars.discourse-cdn.com/v4/letter/o/8797f3/32.png) [@Ole\_Christian\_Marti](https://forum.inductiveautomation.com/u/Ole_Christian_Marti)\
**Post date:** [June 20, 2024, 9:50am UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/1 "2024-06-20T09:50:35Z")

</div>

Hi,

I'm getting an error on the OPC-UA module.  
What is the problem?

```python
java.lang.Exception: OPC server connection is faulted. Type "com.inductiveautomation.OpcUaServerType" is not a known server type.
	at com.inductiveautomation.ignition.gateway.opc.OpcConnectionManagerImpl.newOpcConnection(OpcConnectionManagerImpl.java:158)
	at com.inductiveautomation.ignition.gateway.opc.OpcConnectionManagerImpl.addAllServers(OpcConnectionManagerImpl.java:134)
	at com.inductiveautomation.ignition.gateway.opc.OpcConnectionManagerImpl.startup(OpcConnectionManagerImpl.java:83)
	at com.inductiveautomation.ignition.gateway.IgnitionGateway.startupInternal(IgnitionGateway.java:1086)
	at com.inductiveautomation.ignition.gateway.redundancy.RedundancyManagerImpl.startup(RedundancyManagerImpl.java:293)
	at com.inductiveautomation.ignition.gateway.IgnitionGateway.initRedundancy(IgnitionGateway.java:710)
	at com.inductiveautomation.ignition.gateway.IgnitionGateway.lambda$initInternal$0(IgnitionGateway.java:644)
	at com.inductiveautomation.ignition.common.execution.impl.BasicExecutionEngine$ThrowableCatchingRunnable.run(BasicExecutionEngine.java:518)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source)
	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)

```

8.0.17 (b2020111211)  
Azul Systems, Inc. 11.0.7

---

<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [June 20, 2024, 10:56am UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/2 "2024-06-20T10:56:31Z")

</div>

That looks like a side effect of a separate fault **starting** Ignition's native OPC UA server. Is the OPC module installed? And not faulted? Look for more wrapper log entries related to that.

---

<div class="post-metadata">

**Author:** ![Ole\_Christian\_Marti](https://avatars.discourse-cdn.com/v4/letter/o/8797f3/32.png) [@Ole\_Christian\_Marti](https://forum.inductiveautomation.com/u/Ole_Christian_Marti)\
**Post date:** [June 20, 2024, 11:17am UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/3 "2024-06-20T11:17:31Z")

</div>

Thanks for your reply. The OPC-UA module is installed.

 ![OPC_module](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/2/2240809c87243b787df81800ba5e509edfb85b29.png)

---

<div class="post-metadata">

**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [June 20, 2024, 11:33am UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/4 "2024-06-20T11:33:03Z")

</div>

> [@Ole\_Christian\_Marti](#):
>
> is installed.

And faulted.

You should contact support. Something about your java environment has changed.

(You are also using an unsupported version of Ignition. You should consider upgrading.)

---

<div class="post-metadata">

**Author:** ![Francisco.Mejia](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/francisco.mejia/32/63246_2.png) [@Francisco.Mejia](https://forum.inductiveautomation.com/u/Francisco.Mejia)\
**Post date:** [June 20, 2024, 12:46pm UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/5 "2024-06-20T12:46:52Z")

</div>

I would use an external OPC-UA client to see if you can access it. If you do then you can eliminate that part and concentrate in how you are configuring Ignition.

---

<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:** [June 20, 2024, 1:16pm UTC](https://forum.inductiveautomation.com/t/opc-ua-fault-not-a-known-server-type/92146/6 "2024-06-20T13:16:14Z")

</div>

The module is faulting during startup so I wouldn't expect the server or any client connections to be available.

Provide the wrapper logs or consider calling into support so they can take a look.