# Sequence Number Error from OPC server

**URL:** <https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [July 22, 2019, 3:12pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758 "2019-07-22T15:12:42Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![grietveld](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/grietveld/32/6984_2.png) [@grietveld](https://forum.inductiveautomation.com/u/grietveld)\
**Post date:** [July 22, 2019, 3:12pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758/1 "2019-07-22T15:12:42Z")

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I didn’t see much along the lines of these errors on the forum that pointed to a relevant cause. Does anyone have any ideas on what may be causing these intermittent errors? They aren’t too often, but they are scattered throughout the logs and I wanted to try and address them.

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/2X/b/bba52ac645d7d018069f046c3d818e58c3951b0e.png)

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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:** [July 22, 2019, 3:16pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758/2 "2019-07-22T15:16:34Z")

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What version of Ignition is this happening on?

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<div class="post-metadata">

**Author:** ![grietveld](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/grietveld/32/6984_2.png) [@grietveld](https://forum.inductiveautomation.com/u/grietveld)\
**Post date:** [July 22, 2019, 3:17pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758/3 "2019-07-22T15:17:45Z")

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8.0.2 Release ( **8.0.2 (b2019060511)**)

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<div class="post-metadata">

**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:** [July 22, 2019, 3:24pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758/4 "2019-07-22T15:24:25Z")

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Okay, I think this might be fixed in 8.0.3, which includes a newer version of the OPC UA SDK that has a fix for a bug that looks a lot like this.

In the meantime, you don’t need to worry too much because the ResendData call is succeeding and you aren’t losing any realtime values.

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<div class="post-metadata">

**Author:** ![grietveld](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/grietveld/32/6984_2.png) [@grietveld](https://forum.inductiveautomation.com/u/grietveld)\
**Post date:** [July 22, 2019, 3:25pm UTC](https://forum.inductiveautomation.com/t/sequence-number-error-from-opc-server/26758/5 "2019-07-22T15:25:43Z")

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Ok thanks. I’ll update the system once the 8.0.3 release comes out and see what happens