# Cert-Only Outbound OPC Connection from Ignition

**URL:** <https://forum.inductiveautomation.com/t/cert-only-outbound-opc-connection-from-ignition/44791>\
**Category:** Ignition\
**Created:** [March 23, 2021, 12:45pm UTC](https://forum.inductiveautomation.com/t/cert-only-outbound-opc-connection-from-ignition/44791 "2021-03-23T12:45:37Z")\
**Posts on this page:** 1\
**Showing post:** 2

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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 23, 2021, 12:50pm UTC](https://forum.inductiveautomation.com/t/cert-only-outbound-opc-connection-from-ignition/44791/2 "2021-03-23T12:50:16Z")

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The connection you configured in UaExpert is using X509 authentication, not anonymous authentication. The key and certificate used for this mode of authentication is _not_ the same key and certificate used to secure the connection between client and server (the Application Instance Certificate).

Ignition’s OPC UA client _does not support_ X509 authentication. The advanced configuration option you uncovered is to allow a different Application Instance Certificate to be used by the connection.

If you want to establish an anonymous connection then simply leave the username and password fields blank. But this is _not_ what you did in UaExpert.

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_[View the full topic](https://forum.inductiveautomation.com/t/cert-only-outbound-opc-connection-from-ignition/44791)._