We have Confluence and JIRA setup running on the same hosted server and they run on the same domain under different subdomains. We use NGINX to proxy the requests.
We have followed this link to setup Application Links between the two applications:
https://confluence.atlassian.com/kb/how-to-create-an-unproxied-application-link-719095740.html
Both Application Links indicate that they are connected.
Our current issue is when we go to link a Service Desk project in JIRA to a Knowledge Base space in Confluence we get a vague error indicating that there was a problem completing the request. Does anyone know how to resolve this? Here is a screen shot: