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

@@ -1,7 +1,9 @@
 	# 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)