From 41938d6fd2a2690a6ca5c884a787f819907d1255 Mon Sep 17 00:00:00 2001 From: Eric Eastwood Date: Fri, 19 Dec 2025 14:29:04 -0600 Subject: [PATCH] Log the original bind exception when encountering `Failed to listen on 0.0.0.0, continuing because listening on [::]` (#19297) **Before:** ``` WARNING - call_when_running - Failed to listen on 0.0.0.0, continuing because listening on [::] ``` **After:** ``` WARNING - call_when_running - Failed to listen on 0.0.0.0, continuing because listening on [::]. Original exception: CannotListenError: Couldn't listen on 0.0.0.0:8008: [Errno 98] Address already in use. ``` --- changelog.d/19297.misc | 1 + synapse/app/__init__.py | 4 +++- 2 files changed, 4 insertions(+), 1 deletion(-) create mode 100644 changelog.d/19297.misc diff --git a/changelog.d/19297.misc b/changelog.d/19297.misc new file mode 100644 index 0000000000..aec97fd973 --- /dev/null +++ b/changelog.d/19297.misc @@ -0,0 +1 @@ +Log the original bind exception when encountering `Failed to listen on 0.0.0.0, continuing because listening on [::]`. diff --git a/synapse/app/__init__.py b/synapse/app/__init__.py index 56033f5782..fa436e874b 100644 --- a/synapse/app/__init__.py +++ b/synapse/app/__init__.py @@ -54,7 +54,9 @@ def check_bind_error( """ if address == "0.0.0.0" and "::" in bind_addresses: logger.warning( - "Failed to listen on 0.0.0.0, continuing because listening on [::]" + "Failed to listen on 0.0.0.0, continuing because listening on [::]. Original exception: %s: %s", + type(e).__name__, + str(e), ) else: raise e