I am very new to all this. Just a few weeks now. I've set up my server as per the perfect setup with CentOS 5 on a 64 machine. Installed ISP config. All seems to work. All services etc.. Set up my first site, no problems, set up squirrel mail via the 10 step process, send/receive no problem. Web site access, no problem. Set up three additional sites, including squirrel mail, but those three sites are all shared ip. I've read allot about it here.. Just what causes it? and how to fix it?? All the answers I've seen, don't make sense to me and are far different in each explanation. Also, being dynamic, I am using Dynamic DNS services to forward to my server. Comments.. Help... Thanks..