gh-127319: Disable port reuse on HTTP, XMLRPC, and logging TCP servers

Lib/http/server.py

@@ -115,7 +115,7 @@
 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."""

Lib/logging/config.py

@@ -1018,7 +1018,7 @@ class ConfigSocketReceiver(ThreadingTCPServer):
         """
 
         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):

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):

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

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.