# OPC Connection for PI OSI Soft not connecting. uri: vs urn:

**URL:** <https://forum.inductiveautomation.com/t/opc-connection-for-pi-osi-soft-not-connecting-uri-vs-urn/38118>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [August 27, 2020, 5:33am UTC](https://forum.inductiveautomation.com/t/opc-connection-for-pi-osi-soft-not-connecting-uri-vs-urn/38118 "2020-08-27T05:33:27Z")\
**Posts on this page:** 1\
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**Author:** ![arun1](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/arun1/32/79753_2.png) [@arun1](https://forum.inductiveautomation.com/u/arun1)\
**Post date:** [August 27, 2020, 6:49pm UTC](https://forum.inductiveautomation.com/t/opc-connection-for-pi-osi-soft-not-connecting-uri-vs-urn/38118/3 "2020-08-27T18:49:16Z")

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Thanks. I talked to PI and then IA tech support. The only thing that made it all work was to allow anonymous access in OPC UA server settings. This is ok since it is a test system but it seems like a certificate/authentication issue. Any ideas?

I have seen posts about modifying the certificate:  
[http://forum.inductiveautomation.com/t/uri-specified-in-the-applicationdescription-does-not-match-the-uri-in-the-certificate/37283/12](http://forum.inductiveautomation.com/t/uri-specified-in-the-applicationdescription-does-not-match-the-uri-in-the-certificate/37283/12)

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