Some of the open source applications work as expected due to mod security enabled on the server. It can be enabled or disabled in both the ways either via .htaccess or from WHM control panel. But you must have ConfigServer ModSecurity Control (cmc) Plugin already installed in your WHM on dedicated server.
Step 1: Log in to your dedicated server via SSH using root login.
Step 2: Make sure you download the latest version of ConfigServer ModSecurity Control (cmc) from the following link:
Step 3: Untar the GZip’ed Tar format file with the following command:
tar -xzf cmc.tgz
Step 4: Now, change the directory to the extracted folder:
Setp 5: Simply execute the installer entering the following command:
Step 6: Once it is installed, you can login to your WHM control panel and scroll to the bottom of the left hand menu and there you will find the “ConfigServer Mod Security”