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Debugging IO::Socket Not Connecting

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# 1  
Old 06-10-2010
Debugging IO::Socket Not Connecting
I'm using perl to connect to a port on a unix box from a windows machine. The unix box is located in a remote office and I'm able to connect just fine from my desktop at work across the network. But if I try to remote to another windows machine at the same location as the unix box and try to connect to the port, I get no connection.

Code:
use IO::Socket;
my $sock = new IO::Socket::INET(
   'PeerAddr' => 'xx.xx.xx.xx',
   'PeerPort' => 26637,
   'Proto' => 'tcp',
);
if ($sock) {
   print "Connection established\n";
} else {
   print "Could not connect!\n";
}

For the PeerAddr, I've tried all variations of the address. Is there some way to get an error code from the failed constructor? I have no idea why it failed (can't find the host, port not accepting connections, etc). Anything else I should try?
# 2  
Old 06-10-2010
Can you ping the remote Windows machine?
Is the port you have defined open? (nmap)
If it's open, maybe it's firewalled or something?

Try:
Code:
   print "Could not connect! Reason: $!\n";

# 3  
Old 06-10-2010
The port is open. I'm able to connect from my pc at my office. The unix machine is located in another office in another state. If I try to connect to unix from windows using a pc in the other office, no connection is made. I am able to telnet to the unix machine using the remote windows machine. And I can ping the pc from unix.
# 4  
Old 06-14-2010
did you try what the previous post said, i.e. the $! which gives the system message?

you should also have
Code:
my $sock = new IO::Socket::INET(
   'PeerAddr' => 'xx.xx.xx.xx',
   'PeerPort' => 26637,
   'Proto' => 'tcp',
   reuse => 1,
);

here's why...
Code:
What exactly does SO_REUSEADDR do? 
  This socket option tells the kernel that even if this port is busy (in
  the TIME_WAIT state), go ahead and reuse it anyway.  If it is busy,
  but with another state, you will still get an address already in use
  error.  It is useful if your server has been shut down, and then
  restarted right away while sockets are still active on its port.  You
  should be aware that if any unexpected data comes in, it may confuse
  your server, but while this is possible, it is not likely.

also, you don't need the quotes on the LHS of a
Code:
=>

because
Code:
x=>y

is shorthand for
Code:
"x", y

# 5  
Old 06-14-2010
Yes. $! gives Unknown error. Not too helpful. I also tried Reuse => 1 and it took longer, but still gave the same result. If it is a firewall issue, why can I connect from my pc, but not one in the same office as the unix server? Anyone know of another module to test connections that will give more details?
# 6  
Old 06-21-2010
It was a firewall issue. How do you mark these threads closed?
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