Disguising your server signature is always a good idea as you wont reveal the operating system to potential script kiddies and hackers.
Connect to your server via SSH and login as admin, then ‘su -‘ to root.
Type the following at the command prompt:
pico -w /etc/httpd/conf/httpd.conf
Press [CTRL-W] to start a text search, then type ‘ServerSignature’ and press
Now press [CTRL-O] to save the file, then [CTRL-X] to leave the text editor.
Finally, type the following at the command prompt:
service httpd restart