Fix bug when reloading config with SSL enabled

src/ddns_service/server.py

@@ -7,6 +7,7 @@ import ipaddress
 import json
 import logging
 import signal
+import socket
 import ssl
 import threading
 
@@ -648,9 +649,10 @@ def run_daemon(app):
                     app.config["daemon"]["ssl_cert_file"],
                     app.config["daemon"]["ssl_key_file"]
                 )
-                # Note: existing connections use old cert, new connections use new
+                fd = server.socket.detach()
+                raw_socket = socket.socket(fileno=fd)
                 server.socket = new_context.wrap_socket(
-                    server.socket.detach(), server_side=True
+                    raw_socket, server_side=True
                 )
         except Exception as e:
             logging.error(f"Config reload failed: {e}")