On Sun, 2023-04-30 at 16:41 -0500, Chris Adams wrote:

Once upon a time, Jonathan Ryshpan <jonrysh@pacbell.net> said:
This unit
   $ cat /etc/systemd/system/noip-duc.service
   [Unit]
   Description=No-IP Dynamic Update Client
   After=network.target auditd.service

This should probably be network-online.target.

always fails at boot time with the message status=2/INVALIDARGUMENT

That's the exit code from the program. It is probably the return code from a system call made within the program, not in response to some command-line argument. But if the program runs before the network is up and doesn't handle waiting, that's the most likely culprit.

A very plausible theory. I was sure this would fix the problem; but it is not so. I edited /etc/systemd/system/noip-duc.service as you recommend.

The file noip-duc.service has been edited to change
After=network.target auditd.service
to
After=network-online.target auditd.service

And the problem remains. Further advice would be welcome.

--

Sincerely Jonathan Ryshpan <jonrysh@pacbell.net>

	Common sense is the collection of prejudices
	acquired by the age of eighteen. -- Einstein