# Error during Master and backup pair. "syncRequest"

**URL:** <https://forum.inductiveautomation.com/t/error-during-master-and-backup-pair-syncrequest/83243>\
**Category:** Ignition\
**Created:** [December 18, 2023, 7:38am UTC](https://forum.inductiveautomation.com/t/error-during-master-and-backup-pair-syncrequest/83243 "2023-12-18T07:38:35Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Aisik\_De1](https://avatars.discourse-cdn.com/v4/letter/a/df705f/32.png) [@Aisik\_De1](https://forum.inductiveautomation.com/u/Aisik_De1)\
**Post date:** [December 18, 2023, 7:38am UTC](https://forum.inductiveautomation.com/t/error-during-master-and-backup-pair-syncrequest/83243/1 "2023-12-18T07:38:35Z")

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We have setup a redundant and after switchover it keeps giving us this error. A watchdog tag is running in ignition which is updating too fast.  
This is on the backup side.

 ![ignition](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/5/45f65c94259582867345ba759596999ae0924110.jpeg)

Error executing task 'syncRequest'.  
com.inductiveautomation.metro.api.ex.LocalException: IOException thrown, error was NPSCAFRCHWS01.novoprod.local, header=[opCode=MSG\_SEND, subCode=0, flags=0, messageId=12501, senderId='ignition-npscafrchws01-c02-0-backup', targetAddress='\_0:1:Ignition-npscafrchws01-c02-0']

at com.inductiveautomation.metro.impl.protocol.websocket.WebSocketConnection$RunSend.run(WebSocketConnection.java:1836)

at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.base/java.lang.Thread.run(Unknown Source)

Caused by: java.net.UnknownHostException: NPSCAFRCHWS01.novoprod.local

at java.base/java.net.InetAddress$CachedAddresses.get(Unknown Source)

at java.base/java.net.InetAddress.getAllByName0(Unknown Source)

at java.base/java.net.InetAddress.getAllByName(Unknown Source)

at java.base/java.net.InetAddress.getAllByName(Unknown Source)

at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)

at org.apache.http.impl.conn.DefaultHttpClientConnectionOperator.connect(DefaultHttpClientConnectionOperator.java:112)

at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.connect(PoolingHttpClientConnectionManager.java:376)

at org.apache.http.impl.execchain.MainClientExec.establishRoute(MainClientExec.java:393)

at org.apache.http.impl.execchain.MainClientExec.execute(MainClientExec.java:236)

at org.apache.http.impl.execchain.ProtocolExec.execute(ProtocolExec.java:186)

at org.apache.http.impl.execchain.RetryExec.execute(RetryExec.java:89)

at org.apache.http.impl.execchain.RedirectExec.execute(RedirectExec.java:110)

at org.apache.http.impl.client.InternalHttpClient.doExecute(InternalHttpClient.java:185)

at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:83)

at com.inductiveautomation.metro.impl.protocol.websocket.WebSocketConnection$RunSend.run(WebSocketConnection.java:1797)

... 3 common frames omitted

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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:** [December 18, 2023, 12:27pm UTC](https://forum.inductiveautomation.com/t/error-during-master-and-backup-pair-syncrequest/83243/2 "2023-12-18T12:27:39Z")

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> [@Aisik\_De1](#):
>
> Caused by: java.net.UnknownHostException: NPSCAFRCHWS01.novoprod.local

This is a misconfiguration. Find that problem first.