update backoff criteria

Author: blink1073

pymongo/asynchronous/pool.py

@@ -1033,7 +1033,7 @@ def _handle_connection_error(self, error: Exception, phase: str) -> None:
         # Handle system overload condition.  When the base AutoReconnect is
         # raised and we are not an sdam pool, add to backoff and add the
         # appropriate error label.
-        if not self.is_sdam and "[Errno 54] Connection reset by peer" in str(error):
+        if not self.is_sdam and "connection reset by peer" in str(error).lower():
             self._backoff += 1
             error._add_error_label("SystemOverloaded")
             error._add_error_label("Retryable")

pymongo/synchronous/pool.py

@@ -1029,7 +1029,7 @@ def _handle_connection_error(self, error: Exception, phase: str) -> None:
         # Handle system overload condition.  When the base AutoReconnect is
         # raised and we are not an sdam pool, add to backoff and add the
         # appropriate error label.
-        if not self.is_sdam and "[Errno 54] Connection reset by peer" in str(error):
+        if not self.is_sdam and "connection reset by peer" in str(error).lower():
             self._backoff += 1
             error._add_error_label("SystemOverloaded")
             error._add_error_label("Retryable")