is Comcast filtering ports (ftp, telnet) ?

Question

Hi,The Comcast technician came to install the cable modem for me today and when I got online I noticed that ftp and telnet are blocked.HTTP and SSH work fine. The tech. made a few calls to some engineersover at Comcast but those were useless. Most of them deal with the physical layer and not the IP. I canceled the order for now. Do you know if filtering these ports is part of Comcast policy or are they just filtering them by accident in my area (i live in Chevy Chase,MD)?The tech. support at Comcast has no clue what I'm complaining about. Are there any commond tricks on how to get Comcast to fix this problembefore I place the order again?Is anybody else experiencing the same problem?Thanks in advance,Slava.

$Bill · Accepted Answer

Inbound or outbound ?Are you trying to run a telnet/FTP server on your local machine ?If so, do you have to use the standard port numbers ?

Quaoar · Answer

Comcast AFIK is not blocking either ftp or telnet at my location, CO or WA north of Seattle.  Are you sure your OS is not blocking these protocols?QQ

$Bill · Answer

That's outgoing right ?  He hasn't stated so far if it's incomingor outgoing.

Charlie · Answer

Here in southern Michigan FTP is not blocked.  I just FTP'd my old web page on another ISP to pick up everything I had stashed there without a problem.Charlie

James Knott · Answer

So, what else is new?  ;-)

Charlie · Answer

Yes, it's outgoing.  If I can get a hold of a friend Friday, I'll be able to check incoming.Charlie

Greg · Answer

It must be outgoing. I download from FTP servers all the time

NormanM · Answer

I seriously doubt that Comcast is blocking many ports; beyond port 25 outbound for select customers (who have been identified as sources of abuse through port 25). I would consider router, or software firewall to be a possible issue.

gerry · Answer

Comcast is an collection of very diverse systems set up by diverse sets oftechnical folks. You need a local answer, there is no general one.Are you behind a NAT? FTP is a PITA behind a NAT!gerry

James Knott · Answer

If it's incoming, he should be using ssh and scp, instead of telnet & ftp.

is Comcast filtering ports (ftp, telnet) ?

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