# Unknown OPC tags

**URL:** <https://forum.inductiveautomation.com/t/unknown-opc-tags/32679>\
**Category:** Ignition\
**Created:** [February 27, 2020, 9:04pm UTC](https://forum.inductiveautomation.com/t/unknown-opc-tags/32679 "2020-02-27T21:04:41Z")\
**Posts on this page:** 1\
**Showing post:** 10

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**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:** [March 12, 2020, 8:54pm UTC](https://forum.inductiveautomation.com/t/unknown-opc-tags/32679/10 "2020-03-12T20:54:16Z")

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This is a known issue with some servers described here: [Upgrade 7.9.12 -\> 7.9.13 : Opc Connection faulted](http://forum.inductiveautomation.com/t/upgrade-7-9-12-7-9-13-opc-connection-faulted/30901)

If you can switch the connection to use security it should work again, otherwise a downgrade or upgrade to 7.9.14 when it is eventually released will be needed.

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_[View the full topic](https://forum.inductiveautomation.com/t/unknown-opc-tags/32679)._