DDNS Update Interval
It looks like the pfSense WebGUI doesn't support the ability to set an update interval for the DDNS service. (Or am I overlooking the setting?)
pfSense is communicating with "No-IP.com". According to No-IP, the "last update" took place on May 28th (5 days ago).
Is there a behavior that NEEDS to occur before pfSense will process a DDNS update? (Such as a change in the WAN IP address, 7 days, or something else entirely.)
There is a cron job that runs once per day to update the ddns:
1 1 * * * root /usr/bin/nice -n20 /etc/rc.dyndns.update
The output in Status -> System Logs -> System -> General might look like:
rc.dyndns.update: phpDynDNS (fubar.ddns.net): No change in my IP address and/or 25 days has not passed. Not updating dynamic DNS entry.
Search the log for output from rc.dyndns.update to see additional information about the process.
There are ways to programmatically force an update before 25 days that can be found through a forum search.