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Special Forums IP Networking Help determining what's blocking ports Post 302266509 by brandonros on Wednesday 10th of December 2008 11:28:33 AM
Old 12-10-2008
Haha, no offense taken, you're absolutely right... it doesn't speak well of them. I say I was assigned to do it, because I'm not getting paid anything extra for it. I'm a teacher at a small private school that needed a networking guy so they asked me and I said I'd do what I can.

So I tried telnet and get "could not open connection to the host on port..." I know that these ports are being blocked by something we have here, but I've tried port forwarding on all of the firewalls and routers that I could, and I still get blocked. I've set up utorrent to use port 40000. Is there any program (nmap included) that will determine exactly which local ip address is blocking a certain port? This way, I could narrow it down to what piece of hardware is doing the blocking and work from there.
 

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mconnect(1)							   User Commands						       mconnect(1)

NAME
mconnect - connect to SMTP mail server socket SYNOPSIS
mconnect [-p port] [-r] [hostname] DESCRIPTION
The mconnect utility opens a connection to the mail server on a given host, so that it can be tested independently of all other mail soft- ware. If no host is given, the connection is made to the local host. Servers expect to speak the Simple Mail Transfer Protocol (SMTP) on this connection. Exit by typing the quit command. Typing EOF sends an end of file to the server. An interrupt closes the connection immedi- ately and exits. OPTIONS
The following options are supported: -p port Specify the port number instead of the default SMTP port (number 25) as the next argument. -r "Raw" mode: disable the default line buffering and input handling. This produces an effect similar to telnet(1) to port number 25. OPERANDS
The following operand is supported: hostname The name of a given host. USAGE
The mconnect command is IPv6-enabled. See ip6(7P). FILES
/etc/mail/sendmail.hf help file for SMTP commands ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
telnet(1), sendmail(1M), attributes(5), ip6(7P) Postel, Jonathan B., RFC 821, Simple Mail Transfer Protocol, Information Sciences Institute, University of Southern California, August 1982. SunOS 5.10 9 Nov 1999 mconnect(1)
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