Gentran Integration Suite SFTP Client connections fails

Symptom

Using Gentran Integration Suite version 4.3 and build 4322.   Gentran Integration Suite is acting as the SFTP client.  The SFTP server requires key authentication.  The SFTP Begin Session service fails. 
 

SFTP Client Log reports this exception.

2011-03-09 21:20:21.707] DEBUG 000000000000 GLOBAL_SCOPE TimeoutException thrown' at: 1299705621707
[2011-03-09 21:20:21.707] DEBUG 000000000000 GLOBAL_SCOPE Set synchronizedResponse = false at : 1299705621707
[2011-03-09 21:20:21.707] DEBUG 000000000000 GLOBAL_SCOPE Client.beginSession(BSR) exiting.
[2011-03-09 21:20:21.71] DEBUG 000000000000 GLOBAL_SCOPE BeginSessionService.processData() - Un-registered thread with Ops.
[2011-03-09 21:20:21.71] DEBUG 000000000000 GLOBAL_SCOPE BeginSessionService.processData() - Exiting ...
[2011-03-09 21:20:44.047] ERROR 000000000000 GLOBAL_SCOPE Session.beginSession(BSR,R,PT) runnable caught exception
com.maverick.ssh.SshException: EOF received from remote side [Unknown cause]
at com.maverick.ssh2.TransportProtocol.b(Unknown Source)
at com.maverick.ssh2.TransportProtocol.i(Unknown Source)
at com.maverick.ssh2.TransportProtocol.startService(Unknown Source)
at com.maverick.ssh2.AuthenticationProtocol.<init>(Unknown Source)
at com.maverick.ssh2.Ssh2Client.connect(Unknown Source)
at com.maverick.ssh.SshConnector.connect(Unknown Source)
at com.maverick.ssh.SshConnector.connect(Unknown Source)
at com.sterlingcommerce.woodstock.services.sftpclient.client.Session$1.run(Session.java:191)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:727)
at java.lang.Thread.run(Thread.java:810)