From 49577e6c84ef717022884fdc13a13a584a66cf3c Mon Sep 17 00:00:00 2001
From: mathieui <mathieui@mathieui.net>
Date: Fri, 22 Jan 2021 22:04:41 +0100
Subject: [PATCH] Handle connection errors in start_tls (fix #3449)

---
 slixmpp/xmlstream/xmlstream.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/slixmpp/xmlstream/xmlstream.py b/slixmpp/xmlstream/xmlstream.py
index dc2af77e..6b890729 100644
--- a/slixmpp/xmlstream/xmlstream.py
+++ b/slixmpp/xmlstream/xmlstream.py
@@ -622,6 +622,10 @@ class XMLStream(asyncio.BaseProtocol):
             else:
                 self.event('ssl_invalid_chain', e)
             return False
+        except OSError as exc:
+            log.debug("Connection error:", exc_info=True)
+            self.disconnect()
+            return False
         der_cert = transp.get_extra_info("ssl_object").getpeercert(True)
         pem_cert = ssl.DER_cert_to_PEM_cert(der_cert)
         self.event('ssl_cert', pem_cert)