# 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:** 13\ **Page:** 2
**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, 11:34pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/21 "2021-04-02T23:34:40Z")
You bet; will have the files on the server soon and will send link and password via email to support and PM. ---
**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, 11:49pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/22 "2021-04-02T23:49:58Z")
Well, your 8.1.2 backup shows that both of your OPC UA connections have failover enabled with no additional configuration. But it also looks to me like you came from 7.9 and had once used the OPC UA Next module. I wonder if somewhere along the lines those failover bits got set when the Next module was phased out… edit: no, maybe not the OPC UA Next module, but you did come from 7.9 at some point right? ---
**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, 11:52pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/23 "2021-04-02T23:52:32Z")
Yes, this was originally developed in 7.9.x and in place upgraded multiple times since. The OPC-UA connections were working in 8.1.2 just before this upgrade. I have some older version backups too if they’re of any interest. We didn’t use any outside modules. EDIT: I should have said OPC UA was working without issues in 8.1.2. I didn’t check immediately before this upgrade and it’s possible the connection was already down before this. ---
**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, 11:53pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/24 "2021-04-02T23:53:13Z")
Did you go from 7.9 to 8.1.2 with no other 8.x versions before that? ---
**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, 11:54pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/25 "2021-04-02T23:54:01Z")
Last 4 versions: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/d/8/d8ae46ba19e575d6a56007ba06c26ce994172bb7.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:** [April 2, 2021, 11:54pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/26 "2021-04-02T23:54:39Z")
Can you upload all of those? I’m not sure where the failover bit is being set but I’m thinking maybe on 7.9 -\> 8.x now. It could have been enabled for a while but only blow up now once the connection actually tries to failover. ---
**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, 11:56pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/27 "2021-04-02T23:56:02Z")
They’re all uploaded now; same place, same password. ---
**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, 11:56pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/28 "2021-04-02T23:56:19Z")
Thanks. I’m gonna talk to QA on Monday and see if we can reproduce this. ---
**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, 11:58pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/29 "2021-04-02T23:58:36Z")
Just got an email back from support; this is ticket #13120. ---
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [April 3, 2021, 12:03am UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/30 "2021-04-03T00:03:40Z")
FYI this specific error went away when I cleared the failover checkbox on the Beckhoff OPC UA connection but it still isn’t connecting (digging into that now). I wonder if the set failover checkbox only causes issues if the primary settings fail to connect. I hadn’t even looked at the other OPC UA connection settings as it came up working–cleared that failover checkbox now too! ---
**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 3, 2021, 12:05am UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/31 "2021-04-03T00:05:34Z")
> [@witman](#): > > I wonder if the set failover checkbox only causes issues if the primary settings fail to connect. Yes, that's exactly why you never noticed it before. It looks like failover has been enabled ever since your upgrade to 8.1. ---
**Author:** ![witman](https://avatars.discourse-cdn.com/v4/letter/w/d2c977/32.png) [@witman](https://forum.inductiveautomation.com/u/witman)\ **Post date:** [April 3, 2021, 12:25am UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/32 "2021-04-03T00:25:48Z")
We’re back online–just had to restart the Beckhoff PLC. It was rejecting OPC UA connections for no readily apparent reason (all certificates approved on both sides) and wasn’t responding to OPC UA server restart commands. It appears something on the Beckhoff OPC UA server had hung up causing failure of the main connection which brought up this error on the failover due to that failover box being checked. ---
**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 5, 2021, 5:42pm UTC](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065/33 "2021-04-05T17:42:20Z")
This issue was fixed starting in 8.1.2 but if you had upgraded to any prior 8.0 or 8.1 version it was too late. [Previous page](https://forum.inductiveautomation.com/t/opc-ua-connection-to-siemens-plc-faulting-after-upgrade/41065.md?page=1)