Click on "Capture > Interfaces". A pop up window will show up.
Select a driver to capture traffic from the appropriate network device. Click on the Start button to start capturing traffic.
In Confluence Sharepoint administration page, click on Test Connection.
In Wireshark, click the fourth button or press Ctrl + E.
After the traffic capture is stopped, save the captured traffic into a file (in *.pcap format) and attach it to a support ticket (https:support.atlassian.com). Include IP Address of the servers involved so Support can go through the HTTP dump.