Try adding following to location section and see if it helps:

proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection $http_connection;

The latest versions of Ajenti V packages already have this fixed.

Update ajenti-v-* packages and restart Ajenti or just run apt-get upgrade

Fix released

They are identical symlinks on server, remaining since "ng/" contained Ajenti 1.0 while root repos container 0.6.x series.

Can you please post the generated /etc/nginx/conf.d/titanwar.conf file?

Unfortunately we won't implement this anytime soon as this is only required for shared or reseller hosting, and that's not the goal of Ajenti V project.