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Connecting Slack to On Prem Jira not working

I cant get the Slack JIRA Server connected it just throws an "Oops" message.

We have a JIRA set up as, could the non-standard port be the reason? I dont have the possibility to change this easily so was hoping there would be some other solution.



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Daniel Eads
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
Dec 20, 2021

Hi @Johan Johansson !

The integration should work on a custom port. For example, if the application is served over port 8443 and the URL is specified as, then the integration should work.

However from the documentation, there are two important considerations:

  • The certificate must be signed by a public authority (e.g. Let'sEncrypt), NOT self-signed
  • To create a full connection (not a limited connection), the port must be open to the internet

Looking at your URL, I see that HTTPS is specified in the URL. But - it's on port 8080, which is actually the default non-encrypted port for Jira. I would want to double-check that both conditions are true. You could use the geocerts SSL checker for your URL and port to ensure everything is in good shape. Let us know the results of that test!

Daniel | Atlassian Support

Thanks Daniel, in the end it started working, but not sure if the cert was the problem (but I did install the bundle cert as well before it started working)

If I initiated the integration from JIRA it worked fine (I tried to do it from the Slack admin page where it just complained that the connection couldnt be made).

So to sum up, as your answer lined out, custom ports are not a problem :)

Best regards


Thanks Daniel, yes we use 8080 despite SSL as some of our customer had to punch holes in thier enterprise proxies so we wanted to keep the port number. Anyway I get green on all SSL tests but ”

Certificate Chain Complete?” where it says I should install a root cert (I use a namecheap ssl cert so not self-signed). Could that be the reason?


Daniel Eads
Atlassian Team
Atlassian Team members are employees working across the company in a wide variety of roles.
Dec 20, 2021

It's a possible reason - I would normally refer to the Qualys test at to see what handshakes pass. However, SSL Labs doesn't support testing on non-443 ports. Slack's own documentation also suggests SSL Labs for testing.

Typically it's an intermediary cert that causes issues - for example, many GoDaddy certificates use an intermediary that's not in the trust chain for certain older versions of Java, so that intermediary needs to be included.

If you are able, adding whichever certificate geocerts suggested to the chain would be a next-step. 

Although namecheap does have some bundles listed on their site, they also seem to suggest reaching out to their customer support to get the correct bundle.

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