# Scale Out Architecture - Front & Back End Integration Issue

**URL:** <https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798>\
**Category:** Ignition\
**Tags:** ignition81\
**Created:** [May 2, 2024, 2:23am UTC](https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798 "2024-05-02T02:23:43Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Ben\_Pang](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@Ben\_Pang](https://forum.inductiveautomation.com/u/Ben_Pang)\
**Post date:** [May 2, 2024, 2:23am UTC](https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798/1 "2024-05-02T02:23:43Z")

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Hello,

We are using the scale out architecture for the first time. We seem to have an integration issue between the front end (master-redundancy pair) and the back end (master-redundancy pair) during redundancy failover.

To elaborate the issue:

Ignition-01(Master) and Ignition-01(Backup) are the front-end gateways.  
Ignition-02(Master) and Ignition-02(Backup) are the back-end gateways.

The issue is when the backend Ignition-02(Master) is down and switches to the redundancy - Igniton-02(Backup), the front-end Ignition-01(Master) recognizes the Ignition-02(Master) is down but it would not connect to the redundancy Ignotion-02(Backup) so the front-end loses connection to the back-end.

Please note, in our current gateway connections setting - the front-end master is only set to have incoming connection from the back-end master but not from the back-end backup. As we expected the back-end backup gateway should be able to automatically establish a connection with the front-end during failover?  
Or should we set up the front end to have incoming connection from the back-end backup gateway as well?

Some clarifications would be much appreciated, thank you in advance!

 ![Scale Out Architecture](https://us1.discourse-cdn.com/inductiveautomation/original/3X/5/4/545eeb099d574245d1f8c272f5b6fa3edea5e643.png)

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<div class="post-metadata">

**Author:** ![Ben\_Pang](https://avatars.discourse-cdn.com/v4/letter/b/db5fbb/32.png) [@Ben\_Pang](https://forum.inductiveautomation.com/u/Ben_Pang)\
**Post date:** [May 3, 2024, 7:21am UTC](https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798/2 "2024-05-03T07:21:53Z")

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Any suggestions? Pleeeease 🙂 🙏 🙏

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**Author:** ![jlandwerlen](https://avatars.discourse-cdn.com/v4/letter/j/bc8723/32.png) [@jlandwerlen](https://forum.inductiveautomation.com/u/jlandwerlen)\
**Post date:** [May 3, 2024, 11:55am UTC](https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798/3 "2024-05-03T11:55:13Z")

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I'd contact support and have them help you.

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**Author:** ![Trongkhoi\_Vu](https://avatars.discourse-cdn.com/v4/letter/t/b782af/32.png) [@Trongkhoi\_Vu](https://forum.inductiveautomation.com/u/Trongkhoi_Vu)\
**Post date:** [August 29, 2024, 8:46pm UTC](https://forum.inductiveautomation.com/t/scale-out-architecture-front-back-end-integration-issue/89798/4 "2024-08-29T20:46:19Z")

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Hi, was there any resolution that came from support on this? I plan to have the same implementation.