chmod exception on windows

I am using sshtools to sftp to Windows.  When the SftpClient puts a file 
that does not already exist on the remote file system, it calls chmod to 
set the permissions of the new file.  The put call throws the following 
exception:

java.io.IOException: The network request is not supported. 
        at 
com.sshtools.j2ssh.sftp.SftpSubsystemClient.getOKRequestStatus(Unknown 
Source)
        at 
com.sshtools.j2ssh.sftp.SftpSubsystemClient.setAttributes(Unknown Source)
        at 
com.sshtools.j2ssh.sftp.SftpSubsystemClient.changePermissions(Unknown 
Source)
        at com.sshtools.j2ssh.SftpClient.chmod(Unknown Source)
        at com.sshtools.j2ssh.SftpClient.put(Unknown Source)
        at com.sshtools.j2ssh.SftpClient.put(Unknown Source)

I have considered catching exceptions with the corresponding error code 
but I am afraid that will be too general a measure and that it will cause 
me to ignore real problems.  Has anyone else dealt with this?  Is the only 
work-around to modify the source?