# GAN Incoming Connection Issue

**URL:** <https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883>\
**Category:** Ignition\
**Created:** [September 8, 2023, 12:40am UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883 "2023-09-08T00:40:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![rsnaik](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@rsnaik](https://forum.inductiveautomation.com/u/rsnaik)\
**Post date:** [September 8, 2023, 12:40am UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883/1 "2023-09-08T00:40:37Z")

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Hello Team,

We are trying to establish GAN connection between two server,  
**But not able to get the certificate for approval under incoming connection**.  
we tried both ways S1 to S2 and vice versa.

- Both are able to ping each other.

- Both 8088 and 8060 port are open we cross check with the telnet.

- We are not using SSL.

- Both are connected to single unmanage switch.

- Firewall is also turn off on both server.

- Below error get log in logger.

java.util.concurrent.RejectedExecutionException: Task java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask@7baa9ba4[Not completed, task = java.util.concurrent.Executors$RunnableAdapter@71396a1d[Wrapped task = com.inductiveautomation.metro.impl.protocol.websocket.WebSocketConnection$PingWebSocket@4190ddc7]] rejected from java.util.concurrent.ScheduledThreadPoolExecutor@76e50cf2[Terminated, pool size = 0, active threads = 0, queued tasks = 0, completed tasks = 47]

Thanks in Advance.

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**Author:** ![kcollins](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kcollins/32/19646_2.png) [@kcollins](https://forum.inductiveautomation.com/u/kcollins)\
**Post date:** [September 8, 2023, 1:06am UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883/2 "2023-09-08T01:06:48Z")

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What versions are the gateways? Are all of the gateway network settings at their defaults (in _Config-\>Networking-\>Gateway Network_ and _General Settings_ tab of the web UI) on both systems? Is there a certificate listed in the _Diagnostics_ section on both gateways?

 ![2023-09-07 at 8.06 PM](https://us1.discourse-cdn.com/inductiveautomation/original/3X/9/8/98bc8fb589cf8e49f5463d646a6a288e693c3bbf.png)

This will help validate that the keystore is valid and was generated/loaded correctly when the gateway started up.

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<div class="post-metadata">

**Author:** ![rsnaik](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@rsnaik](https://forum.inductiveautomation.com/u/rsnaik)\
**Post date:** [September 8, 2023, 5:39pm UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883/3 "2023-09-08T17:39:02Z")

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-We are using 8.1.28,

-All setting have default value. SSL check box is clear and we tried with port 8060 and also with 8088.

-We can see certificate listed in both server diagnostics page.

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<div class="post-metadata">

**Author:** ![kcollins](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kcollins/32/19646_2.png) [@kcollins](https://forum.inductiveautomation.com/u/kcollins)\
**Post date:** [September 8, 2023, 6:49pm UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883/4 "2023-09-08T18:49:07Z")

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If you've got SSL/TLS **disabled** on your Gateway Network settings, then you'll need to connect using port 8088.. And consequently, there will be no certificates involved.

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<div class="post-metadata">

**Author:** ![rsnaik](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@rsnaik](https://forum.inductiveautomation.com/u/rsnaik)\
**Post date:** [September 8, 2023, 7:52pm UTC](https://forum.inductiveautomation.com/t/gan-incoming-connection-issue/78883/5 "2023-09-08T19:52:41Z")

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Issue resolved

We deleted the "metro-keystore" file both server (path : "C:\Program Files\Inductive Automation\Ignition\webserver" ) and restarting both the server.

Thanks for your support