This works for me - here is the solution if someone else has a problem.
I initially set the variable POW_EXT_DOMAINS by simply typing in the terminal export POW_EXT_DOMAINS = no-ip.org.
Instead, you should create a pow configuration file in ~ / .powconfig and put the command in this file:
export POW_EXT_DOMAINS=no-ip.org
Then restart pow, manually killing the process in the activity monitor.
Pow then correctly launches the myapp symlink when you access http://myapp.no-ip.org
Hope this helps someone else.
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