From abdb5cb531c0a2a6f376c34e1e1449fd4fb8bb1f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=2E=20K=C3=A4rkk=C3=A4inen?=
 <Tronic@users.noreply.github.com>
Date: Tue, 5 Sep 2023 19:28:46 +0100
Subject: [PATCH] Better diagnostic for permission denied on bind() for low
 ports.

---
 sanic/server/socket.py | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/sanic/server/socket.py b/sanic/server/socket.py
index a77e80a0..755e39c5 100644
--- a/sanic/server/socket.py
+++ b/sanic/server/socket.py
@@ -112,6 +112,16 @@ def configure_socket(
                 server_settings["port"],
                 backlog=backlog,
             )
+        except PermissionError as e:
+            p = server_settings["port"]
+            if p and server_settings["port"] < 1024:
+                addr = f"{server_settings['host']}:{p}"
+                e = ServerError(
+                    f"Permission denied binding to {addr}.\n\n"
+                    "Use `sudo sanic` to run on a privileged port.\n"
+                )
+                e.quiet = True
+            raise e from None
         except OSError as e:  # no cov
             error = ServerError(
                 f"Sanic server could not start: {e}.\n\n"