ISP blocking specific ports

[ross]

Hi, I have a feeling that my isp is blocking remote access to port 80 and  
21 of my computer. I have the ftp sever running but I can only connect  
 from a local machine. I'm curious if there is a way I can test this.

I'm also wondering in what configuration file do I change the port that  
ftpd listens on? I can't seem to find it anywhere.

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