diff --git a/scenes/main.gd b/scenes/main.gd
index 0ad09c2..0e40134 100644
--- a/scenes/main.gd
+++ b/scenes/main.gd
@@ -20,7 +20,8 @@ var _hint_client_connection
 
 func _ready():
 	_hint_server = TCP_Server.new()
-	_hint_server.listen(1235)
+	_hint_server.listen(1235, "127.0.0.1")
+	OS.set_environment("HINT_TCP_PORT", "1235")
 	
 	var args = helpers.parse_args()
 	
diff --git a/scenes/shell.gd b/scenes/shell.gd
index e406540..8074e6b 100644
--- a/scenes/shell.gd
+++ b/scenes/shell.gd
@@ -109,7 +109,7 @@ func _shell_binary():
 #func run_async_thread(command):
 #	var port = 1000 + (randi() % 1000)
 #	var s = TCP_Server.new()
-#	s.listen(port)
+#	s.listen(port, "127.0.0.1")
 #	var _pid = OS.execute("ncat", ["127.0.0.1", str(port), "-c", command], false, [], true)
 #	while not s.is_connection_available():
 #		pass
diff --git a/scenes/tcp_server.gd b/scenes/tcp_server.gd
index 3e5c114..ae1a281 100644
--- a/scenes/tcp_server.gd
+++ b/scenes/tcp_server.gd
@@ -13,7 +13,7 @@ func _ready():
 	start()
 
 func start():
-	_s.listen(port)
+	_s.listen(port, "127.0.0.1")
 		
 func _process(_delta):
 	if _s.is_connection_available():
diff --git a/scenes/tcp_server_shell.gd b/scenes/tcp_server_shell.gd
index 1756170..45223a6 100644
--- a/scenes/tcp_server_shell.gd
+++ b/scenes/tcp_server_shell.gd
@@ -13,7 +13,7 @@ func _ready():
 	start()
 
 func start():
-	_s.listen(port)
+	_s.listen(port, "127.0.0.1")
 		
 func _process(_delta):
 	if _s.is_connection_available():
diff --git a/scenes/text_editor.gd b/scenes/text_editor.gd
index 2018eec..c6e0abe 100644
--- a/scenes/text_editor.gd
+++ b/scenes/text_editor.gd
@@ -10,7 +10,7 @@ var _client_connection
 func _ready():
 	# Initialize TCP server for fake editor.
 	_server = TCP_Server.new()
-	_server.listen(1234)
+	_server.listen(1234, "127.0.0.1")
 	
 func _process(_delta):
 	if _server.is_connection_available():
diff --git a/scripts/hint b/scripts/hint
index 8b24e7a..7ea185d 100755
--- a/scripts/hint
+++ b/scripts/hint
@@ -3,7 +3,7 @@
 use IO::Socket;
 
 $socket = IO::Socket::INET->new(PeerAddr => "127.0.0.1",
-                                PeerPort => 1235,
+                                PeerPort => $ENV{HINT_TCP_PORT},
                                 Proto    => "tcp",
                                 Type     => SOCK_STREAM);