I have a Bitbucket repository set with a webhook to trigger Jenkins builds when some change occurs in the repository. This has been working without issue for a number of years.

From approximately 13:30 Monday 29th November 2021 builds stopped being triggered in Jenkins.

The webhook response in Bitbucket is showing as <No Response>

I have activated logging level "All" for:

com.cloudbees.jenkins.plugins.BitbucketJobProbe

com.cloudbees.jenkins.plugins.BitBucketTrigger

com.cloudbees.jenkins.plugins.BitbucketPayloadProcessor

com.cloudbees.jenkins.plugins.BitbucketHookReceiver

io.jenkins.plugins.bitbucketpushandpullrequest

com.cloudbees.jenkins.plugins.bitbucket.hooks

com.cloudbees.jenkins.plugins.bitbucket.hooks.BitbucketSCMSourcePushHookReceiver

com.cloudbees.jenkins.plugins.bitbucket.hooks.WebhookAutoRegisterListener

Since activating the logs there are no logs containing "hook" from any new commits to Bitbucket.

Aside from Commits no changes have been made in Bitbucket. Our infrastructure team have confirmed that a Proxy is not used. No firewall/ip changes have been made.