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.