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Operating Systems Linux Red Hat Want to unblock port for particular site Post 302762721 by zazzybob on Tuesday 29th of January 2013 02:37:22 AM
Old 01-29-2013
Hi,

Is iptables running on the machine?

Code:
iptables -L -n

If so, you'll need to write a rule to grant access - you might have OUTPUT rules.

You can quickly test if iptables is to blame by (temporarily) disabling it, and telnetting to the destination server on the appropriate port.

Cheers,
ZB
 

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TCPCONNECT(1)						      General Commands Manual						     TCPCONNECT(1)

NAME
tcplisten - general TCP/IP server SYNOPSIS
tcplisten [-irv] [localaddr] port DESCRIPTION
tcplisten waits for a TCP/IP connection on port. If a localaddr parameter is given, tcplisten will bind to that IP address. Otherwise tcplisten will accept connections to any of the local machines IP addresses. Data received from the client is printed on standard output, and data read from standard input is sent to the client. When end-of-file is reached on both standard input and the TCP/IP connection, tcplisten terminates. OPTIONS
-i Terminate at end-of-file on standard input; don't wait for the client to close the connection. -r Terminate when the remote client closes the connection; don't wait for end-of-file on standard input. -v Verbose mode. Prints a message to standard error about the origins (host and port) of the client. SEE ALSO
tcpconnect(1), telnet(1), mini-inetd(1), tcpbug(1). BUGS
The names of the options are not yet finalized, and may change at a future release. 1997 April 13 TCPCONNECT(1)
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