From a43efc8a5a69eb73d4c68f149dad8564710b517a Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Fri, 23 Jun 2017 11:42:35 +0530
Subject: [PATCH] ...

---
 src/calibre/srv/loop.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/calibre/srv/loop.py b/src/calibre/srv/loop.py
index f072db046c..5ec9d75563 100644
--- a/src/calibre/srv/loop.py
+++ b/src/calibre/srv/loop.py
@@ -355,7 +355,7 @@ class ServerLoop(object):
 
     def on_ssl_servername(self, socket, server_name, ssl_context):
         c = self.connection_map.get(socket.fileno())
-        if c.ssl_handshake_done:
+        if getattr(c, 'ssl_handshake_done', False):
             # We do not allow client initiated SSL renegotiation
             return ssl.ALERT_DESCRIPTION_NO_RENEGOTIATION