@Ramkrish,

Check this article to change FTP Port – https://www.tecmint.com/change-ftp-port-in-linux/

I wanted to add configuration settings that proftpd authenticates using openLDAP and creates a chroot directory for each user, can any one direct me in this regards. You help would be much appreciated.

Thanks,
Sai

Create user with home directory in /var/www system path by issuing the below command:

# useradd -md /var/www your_user

Or setup /var/www for already existing users with the same home as above with:

# usermoad -d /var/www your_user