diff --git a/lib/api-functions.coffee b/lib/api-functions.coffee
index 956bf13..899392b 100644
--- a/lib/api-functions.coffee
+++ b/lib/api-functions.coffee
@@ -46,7 +46,13 @@ udpConReq = (address, un, key, callback) ->
 
   message = Buffer.from("GET #{uri} HTTP/1.1\r\nHost: #{address}\r\n\r\n")
 
-  client = dgram.createSocket('udp4')
+  client = dgram.createSocket({type: 'udp4', reuseAddr: true})
+  UDP_CONNECTION_REQUEST_PORT = config.get('UDP_CONNECTION_REQUEST_PORT')
+  if UDP_CONNECTION_REQUEST_PORT
+    # When a device is NAT'ed, the UDP Connection Request must originate from the same address and port used by the STUN server, in order to traverse the firewall.
+    # This does require that the Genieacs NBI and STUN server are allowed to bind to the same address and port.
+    # The STUN server needs to open its UDP port with the SO_REUSEADDR option, allowing the NBI to also bind to the same port.
+    client.bind({port: UDP_CONNECTION_REQUEST_PORT, exclusive: true})
 
   count = 3
   client.send(message, 0, message.length, port, host, f = (err) ->
diff --git a/lib/cluster.js b/lib/cluster.js
index f3f3788..c7dd8b4 100644
--- a/lib/cluster.js
+++ b/lib/cluster.js
@@ -68,6 +68,8 @@ function restartWorker(worker, code, signal) {
 function start(service) {
   logger.init(service, VERSION);
   const config = require("./config");
+  const SERVICE_ADDRESS = config.get(`${service.toUpperCase()}_INTERFACE`)
+  const SERVICE_PORT = config.get(`${service.toUpperCase()}_PORT`)
 
   logger.info({
     message: `GenieACS (genieacs-${service}) starting`,
@@ -78,12 +80,15 @@ function start(service) {
   });
 
   cluster.on("listening", function(worker, address) {
-    logger.info({
-      message: "Worker listening",
-      pid: worker.process.pid,
-      address: address.address,
-      port: address.port
-    });
+    if ((address.addressType === 4 || address.addressType === 6) &&
+        address.address === SERVICE_ADDRESS && address.port === SERVICE_PORT) {
+      logger.info({
+        message: "Worker listening",
+        pid: worker.process.pid,
+        address: address.address,
+        port: address.port
+      });
+    }
   });
 
   cluster.on("exit", restartWorker);
diff --git a/lib/config.coffee b/lib/config.coffee
index c212fe9..c2b3f60 100644
--- a/lib/config.coffee
+++ b/lib/config.coffee
@@ -49,6 +49,8 @@ options = {
   FS_LOG_FILE : {type: 'path', default : ''},
   FS_ACCESS_LOG_FILE : {type : 'path', default : ''},
 
+  UDP_CONNECTION_REQUEST_PORT : {type : 'int', default : 0},
+
   DOWNLOAD_TIMEOUT: {type : 'int', default : 3600},
   EXT_TIMEOUT: {type: 'int', default: 3000},
   MAX_CACHE_TTL : {type : 'int', default : 86400},