Cannot connect to Jira

We are using Mattermost Enterprise 5.12.0 and Jira 9.12.13. We have always been able to connect until May of last year. Is mattermost enterprise compatible with 9.12.13? When I run /jira connect and the jirabot displays with a link. When I click on the link I receive the following error:

failed to get a connect link: post <jira url/plugins/servlet/oauth/request-token: x509: cert signed by unknown authority.
The jira Certs don’t expire until June and the start date of that Cert was in 2021. So other than upgrading we have made no changes to Mattermost or Jira. I checked the webhook configuration and that looks correct.
If I run /jira install if gives me instructions to add an application link but the fields specified in the instruction do not line up with the documentation and it is using private and public keys. There is no place to put private/public keys in the application link setup in Jira.

5.12 is really old. I’d strongly suggest upgrading to 10.5.1, the current ESR.

You’ll need to start by going to 5.19.3, the first ESR after 5.12.x, then ESR to ESR until you’re current. Version archive - Mattermost documentation

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