When trying to connect Bitbucket server to JIRA we get an error setting up the OAUTH link from Bitbucket server to JIRA. In the tab a 500 server error appears. In the log we see:
2016-03-22 10:28:56,125 ERROR [http-nio-7990-exec-2] admin @CZ0RUIx628x3608x0 1im9ygn 10.74.1.20:50596,127.0.0.1 "GET /plugins/servlet/applinks/auth/conf/oauth/add-consumer-by-url/c6394b92-2873-351f-123d-76b02a3e1234 HTTP/1.1" org.apache.velocity ResourceManager : unable to find resource 'auth/applink-missing.vm' in any resource loader.
2016-03-22 10:28:56,188 ERROR [http-nio-7990-exec-2] @CZ0RUIx628x3609x0 1im9ygn 10.74.1.20:50596,127.0.0.1 "GET /mvc/error500 HTTP/1.1" c.a.s.i.web.ErrorPageController There was an unhandled exception loading [/plugins/servlet/applinks/auth/conf/oauth/add-consumer-by-url/c6394b92-2873-351f-123d-76b02a3e1234]
The other way around, JIRA to Bitbucket server seems to work fine. We can enable and disable oauth from within the link in JIRA. All tips are welcome 
Best Regards,
Willem Jan