05-01-2012
Greetings,
As has been previously mentioned, more information about your network topology would probably help in troubleshooting this. That being said, let me toss out a couple situations that might apply to your problem, or if not, maybe they can help get you thinking in the right direction.
First, just because a ping does not succeed does not mean there is a problem. If you are on different subnets or networks, that might be normal. Most networks block ICMP (ping) traffic from entering their networks if not being more restrictive. If however, you have been able to successfully ping before, and now you cannot, then it would seem that there is indeed a network problem and you should contact someone on your network team.
Second, most UNIX and Linux servers use TCP_WRAPPERS to protect network services on their server. This means that in the hosts.allow file, there is most likely an entry allowing you and your computer access via SSH. This is done by allowing your IP address (or subnet perhaps) or hostname access to the system. If by some chance the IP address on your PC has changed (say, by DHCP) that could cause the error you see. Or if they are using a hostname to allow access, it could be a DNS problem if the server you are connecting to cannot perform a reverse DNS lookup on your IP. So there are a couple things to check, make sure your IP hasn't changed and make sure that reverse DNS is working properly for that IP. Plus, the server you are connecting to could be having DNS problems even if DNS in general is functioning on your network.
I hope this helps, please post an update with more information if you are still having problems, or if you find the solution.
Thanks,
Laz
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SSLH(1p) User Contributed Perl Documentation SSLH(1p)
NAME
sslh - Switch incoming connection between SSH and SSL/HTTPS servers
SYNOPSIS
sslh [ -v ] [ -p [host:]port ] [ -t timeout ]
[ --ssh [host:]port ] [ --ssl [host:]port ]
DESCRIPTION
sslh is a simple script that lets you switch an incoming connection on a single port between distinct SSH and SSL/HTTPS servers.
sslh listens for connections on a port and is able to redirect them either to an HTTPS web server or a SSH server.
This lets one setup both a HTTPS web server and a SSH server and access them through the same host+port.
OPTIONS
The program follows the usual GNU command line syntax, with long options starting with two dashes.
-p, --port [host:]port
The port the proxy will listen to. If no port is given, 443 is used by default. If no host is given, "localhost" is used by default.
-s, --ssh [host:]port
The SSH server which the SSH connections must be forwarded to. If omitted, the default is localhost:22.
-l, --ssl, --https [host:]port
The HTTPS server which the HTTPS connections must be forwarded to. If omitted, the default is localhost:443.
-t, --timeout delay
Timeout in seconds before a silent incoming connection is considered as a SSH connection. The number can be fractional.
The default is 2seconds.
-v, --verbose
Verbose output. This option can be used several times for more verbose output.
EXAMPLE OF USE
Is this tool actually useful? Yes.
For example one can use it to access both a SSH server and a secure web server via a corporate proxy that only accepts to relay connections
to port 443. Creating a tunnel that passes SSH connection through a CONNECT-enabled web proxy is easy with connect-tunnel (also included in
the "Net::Proxy" distribution).
The proxy will let both SSH and HTTPS connections out (since they all point to port 443), and the home server will connect those incoming
connections to the appropriate server. This only requires to run the HTTPS server on a non standard port (not 443).
TECHNICAL NOTE
How can this proxy find out what kind of protocol is using a TCP connection to port 443, without being connected (yet) to the server? We
actually rely on a slight difference between the SSL and SSH protocols (found thanks to ethereal):
SSH Once the TCP connection is established, the server speaks first, presenting itself by saying something like:
SSH-2.0-OpenSSH_3.6.1p2 Debian 1:3.6.1p2-1
SSL With SSL, it's always the client that speaks first.
This means that sslh can be used with any pair of protocols/services that share this property (the client speaks first for one and the
server speaks first for the other).
AUTHORS
Original idea and C version
Frederic Ple "<sslh@wattoo.org>".
Perl versions
Philippe 'BooK' Bruhat "<book@cpan.org>".
SCRIPT HISTORY
Version 0.01 of the script was a quick hack designed in 2003 as a proof of concept.
Version 0.02 (and higher) are based on "Net::Proxy", and included with the "Net::Proxy" distribution. Version 0.02 didn't work, though.
Version 0.03 correctly initialised the "in" connector.
Version 0.04 lets the proxy listen on any address (instead of "localhost", which is still the default). Thanks to Dieter Voegtli for
spotting this.
SEE ALSO
Net::Proxy, Net::Proxy::Connector::dual.
COPYRIGHT
Copyright 2003-2006, Philippe Bruhat. All rights reserved.
LICENSE
This module is free software; you can redistribute it or modify it under the same terms as Perl itself.
perl v5.10.1 2009-10-18 SSLH(1p)