I try to config INADYN update client in Freenas under FrreBSD to update IP in Dynu.com...
Please, post correct config file = WORKING and tested. Thanks

Look for tested INADYN config file - for DYNU.COM

I'm using TrueNAS 13 and had a hard time setting up Dynamic DNS service using Dynu. Finally got it to work. Here is the content of /etc/local/inadyn.conf:

period = 300
custom customProvider {
ddns-server = "api.dynu.com"
ddns-path = "/nic/update?username=%u&password=%p&myip=%i&hostname=%h"
ssl = false
checkip-ssl = false
checkip-server = "dynamic.zoneedit.com"
checkip-path = "/checkip.html"
username = "yourname"
password = 'yourpassword'
hostname = { "somethingsomething.ddnsfree.com" }
}

You actually need to enter these values in the GUI, since this file would get overwritten when you start the service. The password could be your actual password, or the MD5 hash of it.

root@backup-remote[/var/log]# md5 -s "yourpassword"
MD5 (yourpassword) = 637b9adadf7acce5c70e5d327a725b13