I have been trying for the past few days to set up a webhook to our Jenkins server and we had our Jenkins server using 4210 for https instead of 443. Our server url is https://jenkins.companyname.com:4210.

My webhook kept failing with NET_ERR with no discernible reason to the failure. As a test I changed our Jenkins server to run behind port 443 and the hook then succeeded. The successful url was https://jenkins.companyname.com.

Are webhooks supposed to work with custom port numbers? If not is there a timeline to update them so hooks can post to alternative ports if needed? In further testing I have verified my URL is valid and does post to Jenkins using a hook in GitHub.