chichi 0 Newbie Poster

"IIS was unable to start the site. Another site may be already using the port you configured"

this is the error im getting
i have many websites on a single windows 2003 server. recently it started that when i create a new site im failing to start the site. i keep getting that error (above).
all my sites are hosted with the same IP address and have the same port.

i really need to get the sites up and running
please help:(
:(