[NTLUG:Discuss] how do i know if port 80 was blocked?

[m m]

Thanks you all for the reply.
I am sorry that I should ask this question as:

How do I know if at&t block incomming http request to/for the ip 12.237.x.x?

the problem is the I have setup a web server, and just don't work (it worked 
before I change cable modem, of course I registered the new MAC address). I 
have heard that the at&t block the port 80 on some area. I wonder my web 
site don't work because they block port 80 on my ip.

thanks.





>From: MadHat <madhat at unspecific.com>
>Reply-To: discuss at ntlug.org
>To: NTLUG-Discuss <discuss at ntlug.org>
>Subject: Re: [NTLUG:Discuss] how do i know if port 80 was blocked?
>Date: 03 Jan 2003 14:20:44 -0600
>
>On Fri, 2003-01-03 at 14:05, Philip Stetz wrote:
> > --- m m <llliiilll at hotmail.com> wrote:
> > >
> > > Hi all:
> > > Is there any to find out if the port 80 was blocked?
> > > IP 12.237.x.x from at&t
> > >
> > > thanks
> > >
> >
> > you can use nmap to do a port scan on that ip.  some
> > sys admins may frown upon that though :)
>
>Depending on how the router/firewall is configured, it may or may not
>tell.  If it just drops the packets, you can't tell if it being blocked,
>or his machine just doesn't have anything on port 80.
>
>If the router sends an ICMP prohibited message, nmap will show filtered,
>but that is not always accurate, as some timeouts will show filtered as
>well.
>
>If the router sends a reset it will just show closed, even though it may
>be blocked.
>
>To be 100% sure, start up a sniffer on the 12.237.x.x machine and then
>telnet to port 80 to it from a machine on a different network and look
>for the traffic in the sniffer.  If it shows up, it isn't blocked.  Of
>course you can still use nmap, but that is overkill.  You can also use a
>plethora of other tools like netcat or any other port scanner, but
>telnet is easy and will do the trick.
>
>
>--
>MadHat at Unspecific.com
>`But I don't want to go among mad people,' Alice remarked.
>`Oh, you can't help that,' said the Cat: `we're all mad here...'
>    -- Lewis Carroll - _Alice's_Adventures_in_Wonderland_
>
>_______________________________________________
>https://ntlug.org/mailman/listinfo/dis

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