Updated agent.py to print a more appropriate exception when unable to connect to the SSH agent

1 files changed, 8 insertions, 2 deletions

diff --git a/paramiko/agent.py b/paramiko/agent.py
index a75ac59e..185666e7 100644
--- a/paramiko/agent.py
+++ b/paramiko/agent.py
@@ -32,7 +32,7 @@ from select import select
 from paramiko.common import asbytes, io_sleep
 from paramiko.py3compat import byte_chr
 
-from paramiko.ssh_exception import SSHException
+from paramiko.ssh_exception import SSHException, AuthenticationException
 from paramiko.message import Message
 from paramiko.pkey import PKey
 from paramiko.util import retry_on_signal
@@ -109,9 +109,15 @@ class AgentProxyThread(threading.Thread):
     def run(self):
         try:
             (r, addr) = self.get_connection()
+            # Found that r should be either a socket from the socket library or None
             self.__inr = r
-            self.__addr = addr
+            self.__addr = addr # This should be an IP address as a string? or None
             self._agent.connect()
+            print("Conn Value: ", self._agent._conn)
+            print("Has fileno method: ", hasattr(self._agent._conn, 'fileno'))
+            print("Verify isinstance of int: ", isinstance(self._agent, int))
+            if self._agent._conn is None or not (hasattr(self._agent._conn, 'fileno') or isinstance(self._agent, int)):
+                raise AuthenticationException("Unable to connect to SSH agent")
             self._communicate()
         except:
             #XXX Not sure what to do here ... raise or pass ?