# OPC-UA Connection to Siemens PLC Faulting After Upgrade **URL:** \ **Category:** Ignition\ **Tags:** ignition80\ **Created:** [November 30, 2020, 7:37pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065 "2020-11-30T19:37:52Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 7:37pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/1 "2020-11-30T19:37:52Z")
I am upgrading a server from 7.9 to 8.1 and the OPC-UA connections that I had to a few Siemens 1500 PLCs are no longer working, the Kepware connections that I have are working though. If I run through the endpoint setup Ignition finds the endpoints just fine and allows me to pick the security options that are enabled in the Siemens PLC. I can also trust the certificate in Ignition. But when I save the connection I get this message about an unsupported protocol? ```auto UaException: status=Bad_InternalError, message=unsupported protocol: null at org.eclipse.milo.opcua.stack.client.DiscoveryClient.getEndpoints(DiscoveryClient.java:189) at com.inductiveautomation.ignition.gateway.opcua.client.ManagedClientKt.initialize(ManagedClient.kt:85) at com.inductiveautomation.ignition.gateway.opcua.client.ManagedClient$create$1.invokeSuspend(ManagedClient.kt:64) at com.inductiveautomation.ignition.gateway.opcua.client.ManagedClient$create$1.invoke(ManagedClient.kt) at com.inductiveautomation.ignition.gateway.opcua.util.Managed$get$deferred$1.invokeSuspend(Managed.kt:40) at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33) at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56) at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678) at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665) 8.1.0 (b2020110211) Azul Systems, Inc. 11.0.7 ``` I’m not sure what that means as I have the old server and new server running side by side and the old server is connected just fine with the same settings. Any thoughts? ---
**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:** [November 30, 2020, 8:04pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/2 "2020-11-30T20:04:27Z")
Any chance you can get a Wireshark capture? edit: or maybe tell me the endpoint URL reported by the server during discovery. edit 2: actually, what discovery/endpoint URL are _you_ specifying during discovery? ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:08pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/3 "2020-11-30T20:08:58Z")
I can work on a wireshark capture. I have to install it on the server. This is what I’m putting in as the endpoint URL (this is what is shown in the Siemens PLC OPC settings) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/2/a26a63a45276b47a7a6f131609a7d6f3f484552a.png) And this is what comes back: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/b/9bebad996b4abe8c610c29573212d86169d7456f.png) ---
**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:** [November 30, 2020, 8:10pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/4 "2020-11-30T20:10:36Z")
If you click the “skip to advanced” link (something like that) at the top of the discovery flow what are the values of those fields it presents? ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:12pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/5 "2020-11-30T20:12:45Z")
![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/1/4129cfdfa20b761dd533558bf34756f164449f75.png) And here is what is set in the Siemens PLC: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/e/4/e4a55664da6243e4459437cbcac6c70d08c73533.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/6/6/66595ddaf7e42335b46e498db6fb1c0d2ce4749c.png) ---
**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:** [November 30, 2020, 8:14pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/6 "2020-11-30T20:14:25Z")
I don’t know, this all looks totally fine. Can you turn the logger `com.inductiveautomation.ignition.gateway.opcua.client.ClientManager` to DEBUG and then edit/save the connection and tell me what gets logged by that logger? ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:21pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/7 "2020-11-30T20:21:27Z")
This is what comes up: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/e/4e0e3c176e1d7b71bbfd6643b1a77d6298c07b38.png) ---
**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:** [November 30, 2020, 8:32pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/8 "2020-11-30T20:32:22Z")
That didn’t connect? It looks like it got further than what would have generated the original error message. Is there a new error message now? ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:33pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/9 "2020-11-30T20:33:45Z")
No, it just keeps trying to connect and then says Faulted with the same error: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/1/d1b262d153f98eed9921f4cca53c30277b12d942.png) EDIT: I have a wireshark capture that I can send you. It won’t let me post it on this thread. ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:37pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/10 "2020-11-30T20:37:26Z")
It seems like every reply from the PLC has this reassembly error, I don’t know what that means. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/6/162475b8bc53f39142d59456def0605bdb46cfe5.png) ---
**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:** [November 30, 2020, 8:37pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/11 "2020-11-30T20:37:39Z")
I think the problem might have something to do with you have a failover endpoint configured that has an invalid endpoint URL. Check the advanced settings on the OPC UA connection and see if there’s any non-default, non-blank values there. ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:40pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/12 "2020-11-30T20:40:37Z")
Oh, that did it! Failover was enabled for some reason but there were no settings. ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/5/152920eb964c9722066f8e7410429c0625395903.png) On the old server the failover was disabled: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/1/0/10ac0b483f309c8287729af93c1949be16825dca.png) When I restored it into 8.1 it enabled it for some reason. ---
**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:** [November 30, 2020, 8:46pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/13 "2020-11-30T20:46:09Z")
If you can open a ticket with support and supply them with your backup we can try to reproduce this and fix anything we find. There might be some bug with the “restore enabled/disabled” functionality catching this failover setting. ---
**Author:** ![Duffanator](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/duffanator/32/3560_2.png) [@Duffanator](https://forum.inductiveautomation.com/u/Duffanator)\ **Post date:** [November 30, 2020, 8:47pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/14 "2020-11-30T20:47:46Z")
Will do. Thanks for the help Kevin! ---
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [April 2, 2021, 11:22pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/15 "2021-04-02T23:22:46Z")
I just ran into this–failover checked and causing an error–when upgrading a server from 8.1.2 to 8.1.4. It was running on 8.1.2, though I hadn’t checked whether failover was enabled before upgrade (it shouldn’t have been). ---
**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:** [April 2, 2021, 11:27pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/16 "2021-04-02T23:27:20Z")
I’m not sure if @Duffanator ever sent a backup to support. If he did then this never made its way back to me or into a ticket that I’ve seen. ---
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [April 2, 2021, 11:31pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/17 "2021-04-02T23:31:46Z")
I’ve got pre/post-upgrade backups of this one I can put on a password protected OwnCloud server for support to access if they might be useful. ---
**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:** [April 2, 2021, 11:32pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/18 "2021-04-02T23:32:40Z")
Yes, I think they would be helpful. It should be easy to see if it was checked or not pre-upgrade. ---
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [April 2, 2021, 11:33pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/19 "2021-04-02T23:33:41Z")
Shall I send an email to support with link and password to access, or PM them to you? ---
**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:** [April 2, 2021, 11:34pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/20 "2021-04-02T23:34:09Z")
Can you do both? I’ll take a look right away but emailing support will make sure this gets tracked like it’s supposed to. [Next page](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065.md?page=2)