Slack notification error in graylog

I am getting these errors in Graylog
Graylog is configured to send a slack notification based on the events and queries.
Tried restarting the services but it’s not helping. Not able to find anything in the community on this topic.

Graylog version - 4.2.5-1
elasticsearch - 7.16.2
mongodb-org - 4.0.27

2022-09-12T04:10:11.283Z ERROR [JobExecutionEngine] Job execution error - trigger=631c77e545797819b9bdfe59 job=61d86d2603cf3f61197c54d9
org.graylog.scheduler.JobExecutionException: Failed to execute notification, retrying in 5 minutes - <61d86d2603cf3f61197c54d8/Error in Daily Report/slack-notification-v1>
	at ~[graylog.jar:?]
	at org.graylog.scheduler.JobExecutionEngine.executeJob( ~[graylog.jar:?]
	at org.graylog.scheduler.JobExecutionEngine.lambda$handleTrigger$2( ~[graylog.jar:?]
	at com.codahale.metrics.Timer.time( ~[graylog.jar:?]
	at org.graylog.scheduler.JobExecutionEngine.handleTrigger( ~[graylog.jar:?]
	at org.graylog.scheduler.JobExecutionEngine.lambda$execute$0( ~[graylog.jar:?]
	at org.graylog.scheduler.worker.JobWorkerPool.lambda$execute$0( ~[graylog.jar:?]
	at com.codahale.metrics.InstrumentedExecutorService$ [graylog.jar:?]
	at java.util.concurrent.ThreadPoolExecutor.runWorker( [?:1.8.0_342]
	at java.util.concurrent.ThreadPoolExecutor$ [?:1.8.0_342]
	at com.codahale.metrics.InstrumentedThreadFactory$ [graylog.jar:?]
	at [?:1.8.0_342]
Caused by: Unable to send the slack Message. Temporary failure in name resolution
	at org.graylog.integrations.notifications.types.SlackClient.send( ~[?:?]
	at org.graylog.integrations.notifications.types.SlackEventNotification.execute( ~[?:?]
	at ~[graylog.jar:?]
	... 11 more

Could be three problems to start with I guess, or the slack address could not be resolved, is wrong or your server can’t reach it.

Caused by: Unable to send the slack Message. Temporary failure in name resolution

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