A2 running Cmd App(s) can be terminated using Command Line or Web Interface.
A2 Kill App - Command Line
a2ctl app [AppName] [kill]
AppName - Existing App Name
kill - Kill the App
A2 Kill App - Web Interface
As you login to A2 - Web Interface, you will see Dashboard. Click on "App Action" under "Operations" section:
This will open "App Action" section. Select "Kill" from Action for given App and Click on "Apply Now" as shown below:
This will ask for confirmation. Click on "OK" as shown below:
Now, the App will be terminated as hown below:
A2 on GitHub
You may also wish to follow the GitHub project if you have a GitHub account. This is also where we keep the issue tracker for sharing bugs and feature ideas.