WordPress SVN Authentication realm

WordPress SVN repository expects the WP.org username and password for authentication.

Authentication realm: <http://plugins.svn.wordpress.org:80> Use your WordPress.org login
Username: myusername
Password for 'myusername': ***********Code language: PHP (php)

I got this prompt when I tried to push my changes to SVN.

At first, the username was wrong, so I left the password empty and hit enter.

SVN asked me to enter my username this time, so I did, and it worked fine.