From 50cb9d5a0e6b920f6b3d8a448d17219cdb24d262 Mon Sep 17 00:00:00 2001
From: Rouven Bauer <rouven.bauer@neo4j.com>
Date: Wed, 20 Oct 2021 13:18:17 +0200
Subject: [PATCH] Log failed attempts of opening a connection

---
 neo4j/io/__init__.py | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/neo4j/io/__init__.py b/neo4j/io/__init__.py
index 0237e1d5..71a35b24 100644
--- a/neo4j/io/__init__.py
+++ b/neo4j/io/__init__.py
@@ -1380,6 +1380,14 @@ def connect(address, *, timeout, custom_resolver, ssl_context, keep_alive):
             s = _secure(s, resolved_address.host_name, ssl_context)
             return _handshake(s, resolved_address)
         except (BoltError, DriverError, OSError) as error:
+            try:
+                local_port = s.getsockname()[1]
+            except (OSError, AttributeError):
+                local_port = 0
+            err_str = error.__class__.__name__
+            if str(error):
+                err_str += ": " + str(error)
+            log.debug("[#%04X]  C: <CONNECTION FAILED> %s", local_port, err_str)
             if s:
                 _close_socket(s)
             errors.append(error)