Deja Dup resolves host name incorrectly, adds ISP hostname

PROBLEM:
I backup to an SSH server via Deja Dup. Recently I am recieving warnings that: my backups are for a computer called my_actual_hostname but the current computer is my_hostname.hawaii.rr.com.

My questions are:
How is Deja Dup resolving my hostname? I have my hostname in /etc/hostname. Python resolves the correct hostname with socket.getfqdn().

Where should I look to troubleshoot? I have already reset my router to factory default.

What could cause Deja Dup, or duplicity, to tack on my ISPs name to my computer name?

Solution 1:

I had changed my hostname in /etc/hostname but I forgot to change it in /etc/hosts. Edit hosts file so that it matches hostname and duplicity is all better.