Issue #17261: Ensure multiprocessing's proxies use proper address.

Lib/multiprocessing/managers.py

@@ -763,6 +763,7 @@ class BaseProxy(object):
         elif kind == '#PROXY':
             exposed, token = result
             proxytype = self._manager._registry[token.typeid][-1]
+            token.address = self._token.address
             proxy = proxytype(
                 token, self._serializer, manager=self._manager,
                 authkey=self._authkey, exposed=exposed

Misc/NEWS

@@ -24,6 +24,8 @@ Core and Builtins
 Library
 -------
 
+- Issue #17261: Ensure multiprocessing's proxies use proper address.
+
 - Issue #17097: Make multiprocessing ignore EINTR.
 
 - Issue #18155: The csv module now correctly handles csv files that use