Slack Channel is timing out

Versions (relevant - OpenSearch-2.2.1/Dashboard/Server OS/Browser):

Describe the issue:
We have created the channel in slacand tried to send the test message but it is getting timeout error.


Relevant Logs or Screenshots:


“"macOS"”,“accept”:“/”,“sec-fetch-site”:“same-origin”,“sec-fetch-mode”:“cors”,“sec-fetch-dest”:“empty”,“referer”:“","accep t-encoding”:“gzip, deflate, br”,“accept-language”:“en-GB,en-US;q=0.9,en;q=0.8”,“securitytenant”:“”},“remoteAddress”:“”,“userAgent”:“Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537. 36 (KHTML, like Gecko) Chrome/ Safari/537.36”,“referer”:“"},“res”:{“statusCode”:500,“responseTime”:30016,"contentLeng th”:9},“message”:“GET /api/notifications/test_message/xUM-pYUBA-6o85CiAK93 500 30016ms - 9.0B”}

Hi @deepak_sharma,

Is you slack channel url configured similar to:<some-id>/<some-id>/<some-id>?
Was this webhook setup using incoming webhooks? documentation
Also have you been able to setup any other notification channels successfully, to see if this is a problem with the plugin in general or the cluster as it might not have proper internet access to send the webhooks.
Also is there any VPC setup that prevents outgoing traffic from the cluster?

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