One way you can check to see if your isp is blocking any ports is
disable your filewall then use an online port scanner like Shields Up.
Every port should show open except those blocked by your isp.
John Schember
On Tue, 2007-04-03 at 20:21 -0700, Jon M. Hanson wrote:
> Joey Prestia wrote:
> > I recently created a free dyndns dynamic account and am having problems
> > accessing my computer I can ping my hostname linuxamd.homelinux.net and
> > it has no packet loss as well as reports the correct ip address of my
> > computer but from other locations I cant access it I can ssh into it but
> > would like to run it as an ftp server what am I doing wrong I know ftp
> > port 21 is forwarded on my linksys router. what do I need to do to have
> > it come up when the address is typed in I'm not using any data of any
> > importance as far as security is concerned until I learn exactly what I
> > need to do to do this safely from my home.
> >
> One thing to consider (other than the huge security implications of
> running an FTP server) is that your ISP may block incoming port 21. Most
> residential ISPs forbid the running of servers on their network.
>
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