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-rw-r--r--synapse/http/federation/matrix_federation_agent.py7
1 files changed, 7 insertions, 0 deletions
diff --git a/synapse/http/federation/matrix_federation_agent.py b/synapse/http/federation/matrix_federation_agent.py
index 4c06a117d3..113fd47134 100644
--- a/synapse/http/federation/matrix_federation_agent.py
+++ b/synapse/http/federation/matrix_federation_agent.py
@@ -323,12 +323,19 @@ class MatrixHostnameEndpoint:
         if port or _is_ip_literal(host):
             return [Server(host, port or 8448)]
 
+        logger.debug("Looking up SRV record for %s", host.decode(errors="replace"))
         server_list = await self._srv_resolver.resolve_service(b"_matrix._tcp." + host)
 
         if server_list:
+            logger.debug(
+                "Got %s from SRV lookup for %s",
+                ", ".join(map(str, server_list)),
+                host.decode(errors="replace"),
+            )
             return server_list
 
         # No SRV records, so we fallback to host and 8448
+        logger.debug("No SRV records for %s", host.decode(errors="replace"))
         return [Server(host, 8448)]