Comcast blocks port 25 incoming, yet again

Tom Buskey tom at buskey.name
Fri May 16 15:19:03 EDT 2008


On Fri, May 16, 2008 at 9:21 AM, Tom Buskey <tom at buskey.name> wrote:

>
>
> As Ben has been saying, the TOS says no servers & sometimes they do things
> to prevent servers.
>
> Port 80 is the easy thing.  I'm surprised they don't block 25, but then the
> problem is outgoing mail, not incoming.
>
> They'll start having issues when they start blocking p2p stuff or
> torrents.  Most of those move around to random ports so it's a harder
> problem.  You can't really do p2p/bittorrent unless you can be a server and
> a client.  Some apps (WoW I think) use bittorrent to distribute patches too.
>
> On a similar note, there's the AOL AIM method.  Lots of places block
> outgoing ports to the default AIM port, so AOL listens on every port for
> AIM.  Chances are, one of those ports is open going out from the client.  If
> you want to find an outgoing hole in a firewall, nmap p1-65535
> oscar.aim.aol.com and you'll get a list of where to put your ssh server.
>
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