From 6c51f8649d5b17eeb218da61583f0ca132fdd728 Mon Sep 17 00:00:00 2001
From: Erik Johnston <erikj@element.io>
Date: Tue, 29 Oct 2024 10:09:25 +0000
Subject: [PATCH] Include the destination in the error of 'Destination
 mismatch' (#17830)

To help debug problems such as
https://github.com/element-hq/synapse/issues/17822
---
 changelog.d/17830.misc                       | 1 +
 synapse/federation/transport/server/_base.py | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 changelog.d/17830.misc

diff --git a/changelog.d/17830.misc b/changelog.d/17830.misc
new file mode 100644
index 000000000..b2cd91c0a
--- /dev/null
+++ b/changelog.d/17830.misc
@@ -0,0 +1 @@
+Include the destination in the error of 'Destination mismatch' on federation requests.
diff --git a/synapse/federation/transport/server/_base.py b/synapse/federation/transport/server/_base.py
index 9094201da..cba309635 100644
--- a/synapse/federation/transport/server/_base.py
+++ b/synapse/federation/transport/server/_base.py
@@ -113,7 +113,7 @@ class Authenticator:
                 ):
                     raise AuthenticationError(
                         HTTPStatus.UNAUTHORIZED,
-                        "Destination mismatch in auth header",
+                        f"Destination mismatch in auth header, received: {destination!r}",
                         Codes.UNAUTHORIZED,
                     )
         if (