From some versions ago seem that there have been a regresion on commandline join( that already happened on early versions of A3 alpha). It always gives you a wrong password mesage.
This issue makes also imposible to use HC client on a passworded server.
Edit: Related ticket http://feedback.arma3.com/view.php?id=2552
(srry search didn't work :S)
1- Create a DS with last development version, and set a password on server.cfg
2- Try to join that server with the client on the same version, starting the client from commandline:
-connect=*ServerIP* -port=2302 -password=*ServerPassword*
3- you will get a invalid password msg
4- Try to join the sever from ingame server browser, enter the password, and you will join without any issue.
Mass closing ancient tickets with no activity for > 12 months; assume fixed or too trivial.
If this issue is still relevant in current dev build, please re-post.