From 55bd3b0535d76e6aae3c1afad27cf7edfc1d8fc9 Mon Sep 17 00:00:00 2001
From: Ken Robbins <ken@surveymonkey.com>
Date: Wed, 14 Sep 2016 15:13:30 -0400
Subject: [PATCH] Add "message 20017" (unexpected EOF from the server) to
 mssql.

Fixes: #3791
Change-Id: I0dade4fe0ecbb53b4a66881594f362986ba73ae8
Pull-request: https://bitbucket.org/zzzeek/sqlalchemy/pull-requests/89
(cherry picked from commit 285d7bbb3e11abdc9a931e35e4ee08ef611af5d4)
---
 doc/build/changelog/changelog_10.rst     | 9 +++++++++
 lib/sqlalchemy/dialects/mssql/pymssql.py | 1 +
 2 files changed, 10 insertions(+)

diff --git a/doc/build/changelog/changelog_10.rst b/doc/build/changelog/changelog_10.rst
index d726435cf8..0e41842334 100644
--- a/doc/build/changelog/changelog_10.rst
+++ b/doc/build/changelog/changelog_10.rst
@@ -18,6 +18,15 @@
 .. changelog::
     :version: 1.0.16
 
+    .. change::
+        :tags: bug, mssql
+        :tickes: 3791
+        :versions: 1.1.0
+
+        Added error code 20017 "unexpected EOF from the server" to the list of
+        disconnect exceptions that result in a connection pool reset.  Pull
+        request courtesy Ken Robbins.
+
     .. change::
         :tags: bug, orm.declarative
         :tickets: 3797
diff --git a/lib/sqlalchemy/dialects/mssql/pymssql.py b/lib/sqlalchemy/dialects/mssql/pymssql.py
index 32e3bd9226..380418b334 100644
--- a/lib/sqlalchemy/dialects/mssql/pymssql.py
+++ b/lib/sqlalchemy/dialects/mssql/pymssql.py
@@ -87,6 +87,7 @@ class MSDialect_pymssql(MSDialect):
             "Not connected to any MS SQL server",
             "Connection is closed",
             "message 20006",  # Write to the server failed
+            "message 20017",  # Unexpected EOF from the server
         ):
             if msg in str(e):
                 return True
-- 
2.47.3