# Redundancy getting disconnected frequently

**URL:** <https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722>\
**Category:** Ignition\
**Created:** [July 21, 2023, 6:14pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722 "2023-07-21T18:14:00Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Amitkumar\_Ravat](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@Amitkumar\_Ravat](https://forum.inductiveautomation.com/u/Amitkumar_Ravat)\
**Post date:** [July 21, 2023, 6:14pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722/1 "2023-07-21T18:14:00Z")

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Redundancy getting disconnected frequently after getting connected.  
getting this below error can anyone explain this?  
Thanks in advance.

 ![MicrosoftTeams-im MicrosoftTeams-image (17)|690x20 age (16)](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/8/58825fbaaebfc42777d5589709745e973e7b30bf.png)

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**Author:** ![aaronrai24](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/aaronrai24/32/87248_2.png) [@aaronrai24](https://forum.inductiveautomation.com/u/aaronrai24)\
**Post date:** [July 21, 2023, 8:35pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722/2 "2023-07-21T20:35:56Z")

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I think `ServiceUnavailableException` requires a gateway restart to be resolved, which gateway is throwing that error? From my understanding the syncRequest task that is required to keep the master and backup gateways in sync is failing because the service between the master and backup gateway that is responsible for executing that task is unavailable, unsure of what may have caused that though.

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**Author:** ![Amitkumar\_Ravat](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@Amitkumar\_Ravat](https://forum.inductiveautomation.com/u/Amitkumar_Ravat)\
**Post date:** [July 21, 2023, 8:39pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722/3 "2023-07-21T20:39:04Z")

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this is backup gateway.  
After few attempt it found some sync missing so gateway went for full pull from master.  
I have tried restarting gateway once.

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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:** [July 21, 2023, 8:45pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722/4 "2023-07-21T20:45:51Z")

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One of the things that can cause this is a change to the installed modules on the master while the backup is disconnected. The backup wouldn't get the new module at the same time, and modules themselves are not part of a sync, so you get stuck. Check your module list (and file versions). If not that, you might need help from support.

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**Author:** ![Amitkumar\_Ravat](https://avatars.discourse-cdn.com/v4/letter/a/3ab097/32.png) [@Amitkumar\_Ravat](https://forum.inductiveautomation.com/u/Amitkumar_Ravat)\
**Post date:** [July 21, 2023, 8:49pm UTC](https://forum.inductiveautomation.com/t/redundancy-getting-disconnected-frequently/76722/5 "2023-07-21T20:49:52Z")

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Thanks @pturmel and @aaronrai24 will check that