Unable to connect to Apache at home from outside

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http://www.linuxquestions.org – I'm running Slackware 13. Apache has been configured and running. That is to say, I can access the server pages on my machine locally using the current DHCP IP address. However I'm unable to access it from outside (say from a friends's house) using the same DHCP IP address. I read on the internet somewhere that some DSL providers disable port 80 to prevent individuals from hosting. I don't know if that's the case but I did try specifying different ports in httpd.conf and added the port number to the IP address URL but still didn't work. Code: Listen 80 Listen 300 I saw some LQ threads which said that the problem could be in the firewall. I don't think I have a firewall but I'm not sure. How do I know that? I'm just trying some stuff without much concern for security at this point. I understand that a DHCP address can change but for now I don't mind entering the IP address explicitly. Any suggestions would be much appreciated. Thanks in advance, Ash. (HowTos)