we've been using Testrail for a while now, but have not been able to properly integrate with our Jira Cloud.
All the links work, the Testrail plugin in Jira works, but when i want to see details, like hovering over a link for issues then Testrail shows a : "Plugin "Jira_REST" returned an error: Received HTTP code 502 from proxy after CONNECT"
So the integration works for creating issues, and linking issues, but it cannot retrieve any data over the REST API.
The configuration is exactly according to specification and instructions.
Any ideas where we may go wrong?