# \[Bug\] Ignition 8.1.7: missing tags in nested UDTs after a gateway restart **URL:** \ **Category:** Ignition\ **Created:** [July 5, 2021, 4:35am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491 "2021-07-05T04:35:44Z")\ **Posts on this page:** 17\ **Page:** 1
**Author:** ![bao.nguyen](https://avatars.discourse-cdn.com/v4/letter/b/8c91f0/32.png) [@bao.nguyen](https://forum.inductiveautomation.com/u/bao.nguyen)\ **Post date:** [July 5, 2021, 4:35am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/1 "2021-07-05T04:35:44Z")
1. Unexpected behaviour - Some tags are missing in nested UDTs after a gateway restart. 1. Expecting to see - No tags missing in nested UDTs after a gateway restart. 1. Steps to reproduce the issue **Please see the attached UDT file. Gateway backup cannot be attached due to size limit** - Importing the target UDTs (with nested UDT instances) with policy ‘overwrite’. - Checking to see that no tags are missing. - Restarting the gateway. - Checking to see missing tags in the nested UDTs (the tags missing may differ from time to time, or from UDT to UDT). ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/8/785447278312cae05892381c29b4d0bb882c0f1a.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/0/3013abdbb3ee4512ef984d4896dc5625dc3ac397.png) ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/9/49971e944033a73b08a01170bd2a2e0807f81e52.png) 1. Helpful information - We have not experienced this issue if the UDTs are created/modified directly in the designer (i.e., not importing with policity ‘overwrite’) - The tags missing can be recovered by applying ‘restart tag’ function in the context menu (i.e., right-click) on the affected UDT. - Ignition version: 8.1.7 - Windows info (running Ignition designer): Windows 10 Pro Version 20H2, OS build 19042.985. [UDT\_root.json](https://forum.inductiveautomation.com/uploads/short-url/4OHiKiDaVmLrgXoyqDpNMC0JA5N.json) (44.1 KB) ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [July 5, 2021, 4:59am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/2 "2021-07-05T04:59:56Z")
I’d be interested, if you had any property overrides on within that folder or on the nested UDTs’ tags in general, if these overrides are still present in 8.1.7. ---
**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\ **Post date:** [July 6, 2021, 12:52pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/3 "2021-07-06T12:52:59Z")
FWIW we have been seeing the same thing across multiple customer installations. We have a ticket in on this exact issue and are waiting on a resolution or a work around. This isn’t happening on 8.1.5, just 8.1.7. It is definitely a crippling bug for sure. ---
**Author:** ![bao.nguyen](https://avatars.discourse-cdn.com/v4/letter/b/8c91f0/32.png) [@bao.nguyen](https://forum.inductiveautomation.com/u/bao.nguyen)\ **Post date:** [July 7, 2021, 1:58am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/4 "2021-07-07T01:58:52Z")
Thank you for your interest. I did a test to see whether overrides would retain after the missing tags are restored - and the overrides still exist after applying ‘restart tag’. Please see the attached gif as a proof. ![overridesRetain](https://us1.discourse-cdn.com/inductiveautomation/original/3X/f/b/fb5787215e9efe7fcf7d4abc75a1c243b47296b3.gif) ---
**Author:** ![bao.nguyen](https://avatars.discourse-cdn.com/v4/letter/b/8c91f0/32.png) [@bao.nguyen](https://forum.inductiveautomation.com/u/bao.nguyen)\ **Post date:** [July 7, 2021, 2:04am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/5 "2021-07-07T02:04:22Z")
Thank you for your information. Our workaround is to apply ‘restart tag’ option (in the context menu) to all the UDTs after a gateway restart. We tried to replicate this ‘restart tag’ behaviour with a script (i.e., using system.tag.getConfiguration() & system.tag.configure()) activated upon a gateway start-up event - and we did not succeed. We hope to see this get fixed in 8.1.8 soon. ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [July 7, 2021, 2:19am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/6 "2021-07-07T02:19:00Z")
Awesome, that’s good news. Otherwise it would be a major bug, thanks for checking! Not that it isn’t at the moment, but certainly far less so than removed data ---
**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\ **Post date:** [July 7, 2021, 12:10pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/7 "2021-07-07T12:10:10Z")
The biggest issue is on a server restart you have to do this… and if you are remotely located and this occurs in the middle of the night then it can be catastrophic for a customer. @bao.nguyen Thanks! I’ll relay this info to my colleagues and have them test it as well. ---
**Author:** ![BillS](https://avatars.discourse-cdn.com/v4/letter/b/9fc348/32.png) [@BillS](https://forum.inductiveautomation.com/u/BillS)\ **Post date:** [July 9, 2021, 12:26am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/8 "2021-07-09T00:26:16Z")
We had a ticket open for something that sounds exactly like this… Inductive just closed it on me without it being resolved… I worked around the problem by completely redesigning my tag structure for the affected UDT’s. And it wasn’t only on startup… I’d have UDT structures just magically disappear. Good luck getting this resolved! Bill S. ---
**Author:** ![thierryv](https://avatars.discourse-cdn.com/v4/letter/t/a8b319/32.png) [@thierryv](https://forum.inductiveautomation.com/u/thierryv)\ **Post date:** [July 15, 2021, 2:38pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/9 "2021-07-15T14:38:22Z")
Bill, Could you explain how you changed your tag structure to work around the issue? ---
**Author:** ![george.s.newbold](https://avatars.discourse-cdn.com/v4/letter/g/7ba0ec/32.png) [@george.s.newbold](https://forum.inductiveautomation.com/u/george.s.newbold)\ **Post date:** [August 2, 2021, 12:58am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/10 "2021-08-02T00:58:15Z")
Yes please Bill, could you explain what you did? ---
**Author:** ![bschroeder](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/bschroeder/32/13260_2.png) [@bschroeder](https://forum.inductiveautomation.com/u/bschroeder)\ **Post date:** [August 3, 2021, 8:58pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/11 "2021-08-03T20:58:49Z")
FYI it appears that this has been fixed in 8.1.8: ```auto Data Model Fixed an issue where UDT Instance members sometimes weren't showing up after upgrade or restart. ``` ---
**Author:** ![george.s.newbold](https://avatars.discourse-cdn.com/v4/letter/g/7ba0ec/32.png) [@george.s.newbold](https://forum.inductiveautomation.com/u/george.s.newbold)\ **Post date:** [August 4, 2021, 4:03am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/12 "2021-08-04T04:03:36Z")
I am using 8.1.7! That is good news, thanks bschroeder. Ill make the upgrade. The problem seems to have settled for now, I lost my UDT tags 3 times in a row after gateway reset. But has stopped happening for now, still using 8.1.7. At least now i’m ultra-zealous about saving my UDT’s and Tags… 🙂 ---
**Author:** ![ajacques](https://avatars.discourse-cdn.com/v4/letter/a/8edcca/32.png) [@ajacques](https://forum.inductiveautomation.com/u/ajacques)\ **Post date:** [August 13, 2021, 7:46pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/13 "2021-08-13T19:46:02Z")
I’m having this same problem in 8.1.7 I see that 8.1.8 is not available for download but I see the same release note (pointed out by @bschroeder - good catch!) in 8.1.9 Has anyone verified that this is fixed in 8.1.9? ---
**Author:** ![bao.nguyen](https://avatars.discourse-cdn.com/v4/letter/b/8c91f0/32.png) [@bao.nguyen](https://forum.inductiveautomation.com/u/bao.nguyen)\ **Post date:** [August 20, 2021, 12:19am UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/14 "2021-08-20T00:19:49Z")
We have upgraded our gateway to 8.1.9 recently - the problem has been fixed since then. ---
**Author:** ![Sayantan\_Chatterjee](https://avatars.discourse-cdn.com/v4/letter/s/9de053/32.png) [@Sayantan\_Chatterjee](https://forum.inductiveautomation.com/u/Sayantan_Chatterjee)\ **Post date:** [October 20, 2022, 12:07pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/15 "2022-10-20T12:07:36Z")
I am using 8.1.20 but I am also facing the issue of disappearing the few UDTs and Tags. Can anyone tell me the solution. I am creating tags using device connection using siemens s7-1500 PLC. ---
**Author:** ![mahesh.madapathi](https://avatars.discourse-cdn.com/v4/letter/m/dec6dc/32.png) [@mahesh.madapathi](https://forum.inductiveautomation.com/u/mahesh.madapathi)\ **Post date:** [January 16, 2026, 7:57pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/16 "2026-01-16T19:57:59Z")
I am on 8.1.51 this happened to me.. Is this still a bug? or what are we doing wrong when creating the UDTs? ---
**Author:** ![tgarrison](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/tgarrison/32/80965_2.png) [@tgarrison](https://forum.inductiveautomation.com/u/tgarrison)\ **Post date:** [January 16, 2026, 8:57pm UTC](https://forum.inductiveautomation.com/t/bug-ignition-8-1-7-missing-tags-in-nested-udts-after-a-gateway-restart/48491/17 "2026-01-16T20:57:58Z")
See this thread: > [@\[IGN-14657\]: UDT deletes standard tags after Gateway Restart](https://forum.inductiveautomation.com/t/ign-14657-udt-deletes-standard-tags-after-gateway-restart/73723/11): > > I would like to add to this and managed to replicate the issue. I have a UDT Definition created that has a parent UDT defined. If i go and create a copy of a tag that comes from the parent UDT, rename it and reconfigure, when i save the tag, it accepts it without issues and propagates to all my instances. The moment I reboot the tag provider, the changes disappear. I tried checking the logs but they are not showing any errors. If i create a new tag (instead of copying a tag from the parent UDT)…