[Zope] modifying zope conf ruins everything

Hi guys, I wanted to access zope from port 80, so i opened the zope conf file and modified the section that says address 8080 into address 80.and saved it, it didn't work. I restored the address into 8080, and now zope is not working at all , i can't access it even from port 8080! Am I doing something wrong? Thanks in advance Regards M. Tleis