Concurrent Identical SFTP Sessions Fail

Symptom

When two concurrent, identical (same client, same server, same direction, same filename, same directory) SFTP sessions are occurring, one session will fail, with a "Failed to read binary packet data" exception in the sftp client log.

sftpclient:

[2009-07-02 13:04:32.639] ERROR
com.maverick.ssh.SshException: Failed to read binary packet data! [Unknown cause]
at com.maverick.ssh2.TransportProtocol.processMessage(Unknown Source)
at com.maverick.ssh2.TransportProtocol.nextMessage(Unknown Source)
at com.maverick.ssh.message.SshMessageRouter.E(Unknown Source)
at com.maverick.ssh.message.SshMessageRouter.nextMessage(Unknown Source)
at com.maverick.ssh.message.SshMessageStore.nextMessage(Unknown Source)
at com.maverick.ssh2.Ssh2Channel.A(Unknown Source)
at com.maverick.ssh2.Ssh2Channel$_C.read(Unknown Source)
at com.maverick.ssh2.Ssh2Channel$_C.read(Unknown Source)
at java.io.DataInputStream.readInt(DataInputStream.java:353)
at com.maverick.ssh.SubsystemChannel$_B.A(Unknown Source)
at com.maverick.ssh.SubsystemChannel.nextMessage(Unknown Source)
at com.maverick.sftp.SftpSubsystemChannel.B(Unknown Source)
at com.maverick.sftp.SftpSubsystemChannel.getOKRequestStatus(Unknown Source)
at com.maverick.sftp.SftpSubsystemChannel.A(Unknown Source)
at com.maverick.sftp.SftpSubsystemChannel.closeFile(Unknown Source)
at com.sterlingcommerce.woodstock.services.sftpclient.client.Session$8.run(Session. java:918)
at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:7 32)
at java.lang.Thread.run(Thread.java:595)