# Any idea why loopback opc connection sometimes fails?

**URL:** <https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365>\
**Category:** Ignition\
**Tags:** perspective\
**Created:** [February 2, 2023, 7:39pm UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365 "2023-02-02T19:39:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![hewking32](https://avatars.discourse-cdn.com/v4/letter/h/b5ac83/32.png) [@hewking32](https://forum.inductiveautomation.com/u/hewking32)\
**Post date:** [February 2, 2023, 7:39pm UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365/1 "2023-02-02T19:39:37Z")

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Hi  
I wonder if its my strange laptop or if its more generic issue affecting more people but sometimes when i start my laptop from the sleep mode opc loopback connection fails - maybe once a week. Most of the time simple restart helps but what steps shall i take to dig deeper in the investigation if it fails again to find out what happened? For example i did perspective elective study yesterday and today i wanted to backup the gateway with finished project for future reference and realised that OPC loopback is failing. Restart did not help and i ended up remove all permissions on OPC UA server and creating new loopback connection from scratch. Then when connection was fixed the project still did not see the tags so i ended up opening udt and refreshing the tags in the udt edit by selection from the opc browser. I feel like maybe there is a way to fix it a lot quicker. I really like Ignition but any ideas or advise in that area please?

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**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:** [February 2, 2023, 7:44pm UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365/2 "2023-02-02T19:44:47Z")

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Were you importing/exporting tags from other systems? The OPC connection name for loopback changed from v7.9 =\> v8+ on fresh installs, but the old name is carried in gateway backups. (The difference is just a dash in OPC-UA being removed.) Anyways, crossing that up can make a bunch of tags appear to be broken.

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**Author:** ![hewking32](https://avatars.discourse-cdn.com/v4/letter/h/b5ac83/32.png) [@hewking32](https://forum.inductiveautomation.com/u/hewking32)\
**Post date:** [February 2, 2023, 8:24pm UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365/3 "2023-02-02T20:24:09Z")

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thanks for reply  
No - i am using ignition 8.1.21 for some time without imports

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**Author:** ![hewking32](https://avatars.discourse-cdn.com/v4/letter/h/b5ac83/32.png) [@hewking32](https://forum.inductiveautomation.com/u/hewking32)\
**Post date:** [February 3, 2023, 7:26am UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365/4 "2023-02-03T07:26:51Z")

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@pturmel during fixing loopback connection i end up creating 2 healthy loopback connection and then removed unnecessary one. I wonder what would happen if i left multiple loopback connection - is it much bigger resource drain or it makes no difference?

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**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:** [February 3, 2023, 1:13pm UTC](https://forum.inductiveautomation.com/t/any-idea-why-loopback-opc-connection-sometimes-fails/69365/5 "2023-02-03T13:13:56Z")

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Non-zero difference but probably not significant. I'd be more concerned with confusion in the designer as to which to use.