Copy and paste the following line into a text file. See also this faq for information on how to use the configuration file.

dyndns.dk

# This is configuration file for
# http://dyndns.dk/
# dynamic DNS service provider
#
# No change is needed in this file
#
# Enter hostname on program complete with domain name
# %HOST% = The hostname before the domainname 
#          (example: myhostname).
# %USER% = The domainname = the username (example: lir.dk)
# %PASS% = The password-hash (you can get it if you log on to 
#          www.dyndns.dk and look in the crontab-url there).

[default]
withpass=0
host=ssl.dyndns.dk
port=443
path=/opdat.php
protocol=https

[requests]
name=%HOST%
domain=%USER%
pw=%PASS%
silent=1

[result]
multilines=1
success=changes:
warning=1001