ISP blocking ports

starnix · Guru Joined: 02 Mar 2003 Posts: 530

Is there any way to get around the fact that my ISP is blocking my ports to prevent serving web, ftp, mail, etc? I am kinda new to this serving thing and I have no alternative ISP for broadband in my town. Any help would be appreciated.

lutzh · Posted: Fri Oct 10, 2003 8:58 am Post subject:

I think there isn't. At least not if you don't count hacking your ISPs router/firewall or moving to another town as solutions.

That is a weird little ISP, though, I never heard of something like that. I would think, if you have a dial-up or DSL style connection, your upstream is very small anyway (I think the best you get is like 256kBit/s for ADSL), so your ISP should not be bothered, and if you have a dedicated line or SDSL, it's usually so high-priced that nobody would take it if their ports where blocked.

Plus, it seems odd that you don't have ISPs that operate nationwide in your country. For dial-up, I mean.

You see, I can't help you at all, but your post got me really curious.

klarnox · Posted: Fri Oct 10, 2003 1:49 pm Post subject:

Web and ftp can be run on pretty much any ports you wish with only a little work on your part. There are guides all over the Internet on how to do this.

As far as mail being blocked, you're out of luck. As far as I know there is nothing you can do to get around the blocked port (without hacking your ISP).

williamv · Posted: Fri Oct 10, 2003 2:46 pm Post subject:

nbensa · Posted: Fri Oct 10, 2003 2:54 pm Post subject:

williamv · Posted: Fri Oct 10, 2003 3:02 pm Post subject:

klarnox · Posted: Fri Oct 10, 2003 3:54 pm Post subject:

The email client isn't the only problem here. When other mail servers attempt to send mail to his server it's going to be on port 25, no way around it. So his mail server will be able to send messages but not receive them (because port 25 is blocked).

Squinky86 · Posted: Fri Oct 10, 2003 4:20 pm Post subject:

Just wanted to post a "me too". My cable modem provider started blocking port 25 and it caused an uproar, but I can't really argue with them.
Luckily, they have smtp, so I installed ssmtp and was good to go with my new mta

. It's actually better than sendmail/postfix/qmail for me- it doesn't run in daemon mode and is fast.
As for the other services, all you can really do is run them on different ports. I still have port 80, so I'm happy I've found workarounds for the port(s?) they have blocked.
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Haro · n00b Joined: 17 May 2003 Posts: 71 Location: West Bend, WI

Charter.net in wisconsin blocks ports 25, 80 and 21 (probably more), so I run my webserver on port 81, and ftp (rarely) on port 121. Easy work arounds, although annoying.

Ian · Posted: Fri Oct 10, 2003 8:38 pm Post subject:

My ISP is starting to be a bitch.

They used to be the "best Cable ISP in America", now I think they've sunk, a lot.

When I first got cable, I was the first on the block (sad, but true), about 3 or 4 years ago. Coverage was spotty for a bit, but now it's great. But they've blocked all my ports, or most, because I "upload too much" off my server. My dad pays for Cable, not just downloads, but uploads too. So it's a pain. I wish there was a geek friendly nation-wide ISP. That'd make everything so much happier...

revertex · l33t Joined: 23 Apr 2003 Posts: 806

Hi people, dunno why i haven't found this tread before.

We share the same pain, but my scenario seems the worst one.

My stupid, crappy, dumbass ISP blocks not only ports like 80, 21, and others well know ports used by server services, it block's almost everything!!

My computer hasn't any kind of firewall,(welcome scriptkids!) nor my adsl/router, but probing my ip for open ports it shows everything is closed, blocked or in stealth state.

(tools used to concluded this: ethereal, ntop, nessus, nmap and shields-up from www.grc.com)

Facts: i cannot run any kind of server services (exept a mta, port 25 seems open, it seems they don't care with spammers).

Can't play tons of on-line games, (included Enemy Territory).

Can't host a game server.

Can't send, recive any kind of file using yahoo, msn, aol messenger.(jabber not tested).

Voice chat does't work too.

Donkey/mule network does't work.(fasttrack works fine, but who cares? just a pr0n p2p network).

Netmeeting/Gnomemeeting does't transmit/recive any kind of sound/image or files.

My ISP use some kind of proxy running the well hated for me SecurePoint Firewall, it seems analize all traffic to decide what will be blocked in realtime.

Needless to say i can't redirect any service to a higher port because are all closed/blocked.

Note: its the biggest adsl provider in my coutry (it isn't a communist country).

At least people here seems only use internet to pr0n surf, pr0n mass download via fasttrack, irc (at least only chat works, not well tested), warez download, chat rooms (more pr0n), pop mail to read their spam and spread worms and viruses as usual.

Marvelous country to live...far away any computer.

:evil:

mirko_3 · l33t Joined: 02 Nov 2003 Posts: 605 Location: Birreria

wow, what country is that??
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