sockets on webserver

My question is: are there going to be problems in accessing ports on webserver machine? If so, what is the best way to overcome them?
Actually ole if there is no restriction from ur ISP on some particular port number or range of port numbers then there will be no problem. R u developing some ActiveX control or some applet . Some times there will be browser restriction occur so u have to update ur browser security level to low. Also in case of applets u can connect ur applet to same IP address from where ur WebServer running. I want to say if u r running ur WebServer on Different IP and u r running ur application of different IP ( though machine is same ) then u will face security restriction.