# OPC Connections

**URL:** <https://forum.inductiveautomation.com/t/opc-connections/90974>\
**Category:** Ignition\
**Tags:** opcua\
**Created:** [May 27, 2024, 7:29pm UTC](https://forum.inductiveautomation.com/t/opc-connections/90974 "2024-05-27T19:29:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Tomas\_Morales](https://avatars.discourse-cdn.com/v4/letter/t/f1d935/32.png) [@Tomas\_Morales](https://forum.inductiveautomation.com/u/Tomas_Morales)\
**Post date:** [May 27, 2024, 7:29pm UTC](https://forum.inductiveautomation.com/t/opc-connections/90974/1 "2024-05-27T19:29:33Z")

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I went from version 7.5.14 to 7.6.7 and lost the connection to the OPC.

Could not open secure channel to opc.tcp://ip:port/isopvus/Basic128Rsa15

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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:** [May 27, 2024, 8:40pm UTC](https://forum.inductiveautomation.com/t/opc-connections/90974/2 "2024-05-27T20:40:55Z")

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I don't know what is possible with those versions, but upgrading from one ancient and unsupported old version to **another** ancient and unsupported version seems unwise.

Consider re-installing v7.5.14 to get running again, then start planning an upgrade to v8.1 via a fully-testable development environment.

If planning the latter, IA support will be able to help. (They might help anyways, but those are both **really** old versions.)

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**Author:** ![Tomas\_Morales](https://avatars.discourse-cdn.com/v4/letter/t/f1d935/32.png) [@Tomas\_Morales](https://forum.inductiveautomation.com/u/Tomas_Morales)\
**Post date:** [May 27, 2024, 8:53pm UTC](https://forum.inductiveautomation.com/t/opc-connections/90974/3 "2024-05-27T20:53:42Z")

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Is it really possible to upgrade from an older version of 7.5.14 to a newer one like 8.1? Because I tried to do an upgrade from 7.1.8 to 8.1 and it was not possible so I made the decision to do progressive upgrades.

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<div class="post-metadata">

**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:** [May 27, 2024, 8:57pm UTC](https://forum.inductiveautomation.com/t/opc-connections/90974/4 "2024-05-27T20:57:43Z")

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It is supposed to be possible.

But I have seen cases where format changes made it necessary to hop through the last of each LTS version. (Skip 7.6.x, 7.8.x, 8.0.x.)

But I wouldn't try to get external connections working in the interim versions, just make sure everything **inside** Ignition looks present.

Get connections working only once you reach a supported version.