# OPC-UA Server connected but tags in the Designer stills show Uncertain\_LastKnownValue **URL:** \ **Category:** Ignition\ **Created:** [December 25, 2020, 2:34am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785 "2020-12-25T02:34:10Z")\ **Posts on this page:** 11\ **Page:** 1
**Author:** ![lang.le-van](https://avatars.discourse-cdn.com/v4/letter/l/5e9695/32.png) [@lang.le-van](https://forum.inductiveautomation.com/u/lang.le-van)\ **Post date:** [December 25, 2020, 2:34am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/1 "2020-12-25T02:34:11Z")
I get the issues with the ignition 8.1.1 every time I using ignition after turn on my laptop. OPC-UA connected to PLC via ModbusTCP and I can check the tag value by OPC Quick Client. But that tags in the Designer still show Uncertain\_LastKnownValue. Each time get issue, I must be restart OPC-UA module. So, please help me to resolve this issues. (The same issues with Ignition 8.0.16, 8.017 and 8.1.0 ---
**Author:** ![BenKearney](https://avatars.discourse-cdn.com/v4/letter/b/b19c9b/32.png) [@BenKearney](https://forum.inductiveautomation.com/u/BenKearney)\ **Post date:** [December 26, 2020, 12:42pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/2 "2020-12-26T12:42:46Z")
Is there another device also trying to connect to that modbus device on the same port? ---
**Author:** ![lang.le-van](https://avatars.discourse-cdn.com/v4/letter/l/5e9695/32.png) [@lang.le-van](https://forum.inductiveautomation.com/u/lang.le-van)\ **Post date:** [December 26, 2020, 1:03pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/3 "2020-12-26T13:03:09Z")
Device only connects to laptop (direct connection). I tried with three different laptop but still get the same issues. ---
**Author:** ![JohnMck](https://avatars.discourse-cdn.com/v4/letter/j/eada6e/32.png) [@JohnMck](https://forum.inductiveautomation.com/u/JohnMck)\ **Post date:** [January 3, 2021, 11:16pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/4 "2021-01-03T23:16:14Z")
I’m getting the exact same problem. Tags all show up in the OPC browser. Device connection is “connected”. But tags all say Uncertain\_LastKnownValue. No other devices except the host PC and the target A/B L33ER (v32). Restart the OPC\_UA module and it all comes back to life. ---
**Author:** ![lang.le-van](https://avatars.discourse-cdn.com/v4/letter/l/5e9695/32.png) [@lang.le-van](https://forum.inductiveautomation.com/u/lang.le-van)\ **Post date:** [January 4, 2021, 9:48am UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/5 "2021-01-04T09:48:43Z")
I found another things, that problem does not only occur with the real device but also with the Programmable Device Simulator. ---
**Author:** ![julian.medina](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/julian.medina/32/9805_2.png) [@julian.medina](https://forum.inductiveautomation.com/u/julian.medina)\ **Post date:** [January 7, 2021, 7:02pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/6 "2021-01-07T19:02:39Z")
I’m running 8.0.15 and I just stumbled upon this exact problem, all my 30+ Modbus devices showing “Uncertain\_LastKnownValue”. Additional data: Besides those modbus devices, I have 6-8 S7-1500 PLCs which had no connection issues. I’m going to try to restart the module EDIT: Restarting the module helped to restore communications. ---
**Author:** ![zelghoul](https://avatars.discourse-cdn.com/v4/letter/z/49beb7/32.png) [@zelghoul](https://forum.inductiveautomation.com/u/zelghoul)\ **Post date:** [April 1, 2021, 1:41pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/7 "2021-04-01T13:41:34Z")
I had the same issue with a template, I had to restart everything including my machine and it fixed it. ---
**Author:** ![julian.medina](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/julian.medina/32/9805_2.png) [@julian.medina](https://forum.inductiveautomation.com/u/julian.medina)\ **Post date:** [April 1, 2021, 4:31pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/8 "2021-04-01T16:31:01Z")
Did you try restarting only the module? it’s easier than restarting the whole gateway ---
**Author:** ![kcoulter](https://avatars.discourse-cdn.com/v4/letter/k/5e9695/32.png) [@kcoulter](https://forum.inductiveautomation.com/u/kcoulter)\ **Post date:** [April 26, 2021, 3:22pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/9 "2021-04-26T15:22:48Z")
I have the same problem. Once I restarted the OPC-UA module it cleared. ---
**Author:** ![yin.cheng](https://avatars.discourse-cdn.com/v4/letter/y/85f322/32.png) [@yin.cheng](https://forum.inductiveautomation.com/u/yin.cheng)\ **Post date:** [July 14, 2021, 2:04pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/10 "2021-07-14T14:04:25Z")
Same here. Im using Omron FINS/TCP driver with ignition edge 8.0.16. Im wondering if there is a relation to the sequence of starting up? I.e if gateway is first up, then only plc is connected/online, somehow the problem is triggered? But not all the time… Because for my case, the problem only exist during the first startup of the gateway/pc, once in a while… ---
**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:** [July 14, 2021, 3:09pm UTC](https://forum.inductiveautomation.com/t/opc-ua-server-connected-but-tags-in-the-designer-stills-show-uncertain-lastknownvalue/41785/11 "2021-07-14T15:09:43Z")
See [Edge OPC UA Omron FINS/TCP connection, tag status showing uncertain - #4 by Kevin.Herron](http://forum.inductiveautomation.com/t/edge-opc-ua-omron-fins-tcp-connection-tag-status-showing-uncertain/48346/4)