From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Mon, 16 Jun 2025 07:05:26 +0000 (+0200)
Subject: [3.14] gh-127319: Disable port reuse on HTTP, XMLRPC, and logging TCP servers (GH... 
X-Git-Tag: v3.14.0b3~18
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=43bf8b30f918cb72ac9b992d55cdebf9c4299288;p=thirdparty%2FPython%2Fcpython.git

[3.14] gh-127319: Disable port reuse on HTTP, XMLRPC, and logging TCP servers (GH-135405) (GH-135538)

(cherry picked from commit 2bd3895fcabb2dfdae5c0c72e60483e3d3267f0f)
---

diff --git a/Lib/http/server.py b/Lib/http/server.py
index dda32644a28f..10d18a9a7539 100644
--- a/Lib/http/server.py
+++ b/Lib/http/server.py
@@ -137,7 +137,7 @@ DEFAULT_ERROR_CONTENT_TYPE = "text/html;charset=utf-8"
 class HTTPServer(socketserver.TCPServer):
 
     allow_reuse_address = True    # Seems to make sense in testing environment
-    allow_reuse_port = True
+    allow_reuse_port = False
 
     def server_bind(self):
         """Override server_bind to store the server name."""
diff --git a/Lib/logging/config.py b/Lib/logging/config.py
index c994349fd6ee..3d9aa00fa52d 100644
--- a/Lib/logging/config.py
+++ b/Lib/logging/config.py
@@ -1018,7 +1018,7 @@ def listen(port=DEFAULT_LOGGING_CONFIG_PORT, verify=None):
         """
 
         allow_reuse_address = True
-        allow_reuse_port = True
+        allow_reuse_port = False
 
         def __init__(self, host='localhost', port=DEFAULT_LOGGING_CONFIG_PORT,
                      handler=None, ready=None, verify=None):
diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 1e5adcc8db13..98ed154d8c65 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -1036,7 +1036,7 @@ class TestTCPServer(ControlMixin, ThreadingTCPServer):
     """
 
     allow_reuse_address = True
-    allow_reuse_port = True
+    allow_reuse_port = False
 
     def __init__(self, addr, handler, poll_interval=0.5,
                  bind_and_activate=True):
diff --git a/Lib/xmlrpc/server.py b/Lib/xmlrpc/server.py
index 90a356fbb8ea..8130c739af2f 100644
--- a/Lib/xmlrpc/server.py
+++ b/Lib/xmlrpc/server.py
@@ -578,7 +578,7 @@ class SimpleXMLRPCServer(socketserver.TCPServer,
     """
 
     allow_reuse_address = True
-    allow_reuse_port = True
+    allow_reuse_port = False
 
     # Warning: this is for debugging purposes only! Never set this to True in
     # production code, as will be sending out sensitive information (exception
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-06-11-15-08-10.gh-issue-127319.OVGFSZ.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-11-15-08-10.gh-issue-127319.OVGFSZ.rst
new file mode 100644
index 000000000000..d90153c96841
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-06-11-15-08-10.gh-issue-127319.OVGFSZ.rst
@@ -0,0 +1,3 @@
+Set the ``allow_reuse_port`` class variable to ``False`` on the XMLRPC,
+logging, and HTTP servers. This matches the behavior in prior Python
+releases, which is to not allow port reuse.