Exception in thread Thread-3:
Traceback (most recent call last):
  File "C:Python27libthreading.py", line 801, in __bootstrap_inner
    self.run()
  File "C:Python27libsite-packagesparamikoagent.py", line 117, in run
    raise AuthenticationException("Unable to connect to SSH agent")

privkey = paramiko.RSAKey.from_private_key_file(PrivKeyDirFile, password = PrivKeyPw)

# Start the client
client = paramiko.client.SSHClient()
client.set_missing_host_key_policy(paramiko.client.AutoAddPolicy())
client.load_system_host_keys()
client.connect(hostname = Host, username = User, pkey = privkey)
# get a session
sshChannel = client.get_transport().open_session()
# set up the agent request handler to handle agent requests from the server
paramiko.agent.AgentRequestHandler(sshChannel)  # <--UNDOCUMENTED??!!
# get a shell
sshChannel.get_pty()
sshChannel.invoke_shell()

# SNIP

sshChannel.send

("command-which-invokes-fab-scriptn")
# error now happens