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-rw-r--r--synapse/util/retryutils.py8
1 files changed, 5 insertions, 3 deletions
diff --git a/synapse/util/retryutils.py b/synapse/util/retryutils.py
index b94ae369cf..153ef001ad 100644
--- a/synapse/util/retryutils.py
+++ b/synapse/util/retryutils.py
@@ -129,11 +129,13 @@ class RetryDestinationLimiter(object):
             # APIs may expect to never received e.g. a 404. It's important to
             # handle 404 as some remote servers will return a 404 when the HS
             # has been decommissioned.
+            # If we get a 401, then we should probably back off since they
+            # won't accept our requests for at least a while.
+            # 429 is us being aggresively rate limited, so lets rate limit
+            # ourselves.
             if exc_val.code == 404 and self.backoff_on_404:
                 valid_err_code = False
-            elif exc_val.code == 429:
-                # 429 is us being aggresively rate limited, so lets rate limit
-                # ourselves.
+            elif exc_val.code in (401, 429):
                 valid_err_code = False
             elif exc_val.code < 500:
                 valid_err_code = True