When creating a new synchronization there is an validation error for the Base URL field: "The server '%baseUrl%' is not reachable".
This typically happens on Unix servers where the networking is setup in a certain way that Java cannot handle it correctly.
As Backbone uses the HTTP(s) protocol to talk to itself and depending on your set up also to the other instance, the server must be able to resolve the Base Urls, but it can't.
The following steps should be done in order to resolve this problem. Let's assume your server's IP address is
126.96.36.199, the JIRA server's hostname is
jiraserver and the domain of the server is
jira.example.com . Please replace those assumptions with your values.
Open the file
/etc/hostsand check if there is a line for your IP address containing the hostname (short version and fully qualified). The line should look like
188.8.131.52 jiraserver jira.example.comCODE
If there is a line like
127.0.0.1 localhost localhost.localdomain jiraserver jiraserver.local jira.example.comCODE
please split it into two separate lines and replace the loopback IP (127.0.0.1, ::1) with the actual IP of your server. The result should look like this:
127.0.0.1 localhost localhost.localdomain 184.108.40.206 jiraserver jiraserver.local jira.example.comCODE