since the management server binds to 127.0.0.1, must use that and not...

since the management server binds to 127.0.0.1, must use that and not 'localhost' to connect to it because 'localhost' resolves to the IPv6 ::1 when it is available, see #224

conf/nginx-primaryonly.conf

 	# Control Panel
+	# Proxy /admin to our Python based control panel daemon. It is
+	# listening on IPv4 only so use an IP address and not 'localhost'.
 	rewrite ^/admin$ /admin/;
 	location /admin/ {
-		proxy_pass http://localhost:10222/;
+		proxy_pass http://127.0.0.1:10222/;
 		proxy_set_header X-Forwarded-For $remote_addr;
 	}
 

management/daemon.py

@@ -278,5 +278,6 @@ if __name__ == '__main__':
 	# debug console and enter that as the username
 	app.logger.info('API key: ' + auth_service.key)
 
+	# Start the application server. Listens on 127.0.0.1 (IPv4 only).
 	app.run(port=10222)
 

tools/mail.py

@@ -3,7 +3,8 @@
 import sys, getpass, urllib.request, urllib.error, json
 
 def mgmt(cmd, data=None, is_json=False):
-	mgmt_uri = 'http://localhost:10222'
+	# The base URL for the management daemon. (Listens on IPv4 only.)
+	mgmt_uri = 'http://127.0.0.1:10222'
 
 	setup_key_auth(mgmt_uri)