Description:
------------
Calling ssh2_connect returns with an error in a situation where it should not.

Reproduce code:
---------------
$con = ssh2_connect('pbptgemapp1', 22);
if (!$con) {
  print "Connection failed !";
}

Expected result:
----------------
I expect to see no output and to have a valid handle in $con


Actual result:
--------------
Warning: ssh2_connect() [function.ssh2-connect]: Error starting up SSH connection(-5): Unable to exchange encryption keys in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\ssh2.php on line 5

Warning: ssh2_connect() [function.ssh2-connect]: Unable to connect to pbptgemapp1 in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\ssh2.php on line 5
Connection failed !

It may be necessary to use Windows to reproduce the problem. (I am using Apache/2.2.4 (Win32) PHP/5.2.3)