# Zero TNS connection in OPC UA Configuration

**URL:** <https://forum.inductiveautomation.com/t/zero-tns-connection-in-opc-ua-configuration/9017>\
**Category:** General Discussion\
**Created:** [September 5, 2014, 8:15pm UTC](https://forum.inductiveautomation.com/t/zero-tns-connection-in-opc-ua-configuration/9017 "2014-09-05T20:15:31Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bmyers](https://avatars.discourse-cdn.com/v4/letter/b/ccd318/32.png) [@bmyers](https://forum.inductiveautomation.com/u/bmyers)\
**Post date:** [September 5, 2014, 8:15pm UTC](https://forum.inductiveautomation.com/t/zero-tns-connection-in-opc-ua-configuration/9017/1 "2014-09-05T20:15:31Z")

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Can anyone shed some light on what the Zero TNS connection is for in the OPC UA configuration ?

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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:** [September 5, 2014, 8:19pm UTC](https://forum.inductiveautomation.com/t/zero-tns-connection-in-opc-ua-configuration/9017/2 "2014-09-05T20:19:04Z")

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I assume you mean when connecting to a MicroLogix using the MicroLogix driver… but it’s basically just a giant hack/work-around for a certain old buggy version of MicroLogix firmware. If all settings are correct but you’re unable to connect, using this option _might_ be the answer.