diff --git a/ocaml/Qmcchem_config.ml b/ocaml/Qmcchem_config.ml
index d9f302d..3a82387 100644
--- a/ocaml/Qmcchem_config.ml
+++ b/ocaml/Qmcchem_config.ml
@@ -83,7 +83,7 @@ let hostname = lazy (
   try
     Unix.gethostname ()
   with
-  | _ -> "localhost"
+  | _ -> "127.0.0.1"
 )
 
 
diff --git a/ocaml/Qmcchem_dataserver.ml b/ocaml/Qmcchem_dataserver.ml
index 3067996..73cc34e 100644
--- a/ocaml/Qmcchem_dataserver.ml
+++ b/ocaml/Qmcchem_dataserver.ml
@@ -100,7 +100,7 @@ let run ?(daemon=true) ezfio_filename =
             ZMQ.Socket.bind socket address;
             accu
           with
-          | _ -> false;
+          | _ -> false
         in
         ZMQ.Socket.close socket; 
         result
diff --git a/ocaml/Qmcchem_run.ml b/ocaml/Qmcchem_run.ml
index 7a1a465..368695c 100644
--- a/ocaml/Qmcchem_run.ml
+++ b/ocaml/Qmcchem_run.ml
@@ -12,13 +12,16 @@ let full_run ?(start_dataserver=true) ezfio_filename  =
 
 
   (* Create the node file *)
-  let server_file = 
-    Filename.concat ezfio_filename "nodefile"
-  in
-  Out_channel.with_file server_file ~f:(fun out_channel ->
-    Launcher.create_nodefile ()
-    |> Out_channel.output_string out_channel 
-  ) ;
+  (*
+  let () =
+    let server_file = 
+      Filename.concat ezfio_filename "nodefile"
+    in
+    Out_channel.with_file server_file ~f:(fun out_channel ->
+      Launcher.create_nodefile ()
+      |> Out_channel.output_string out_channel 
+    ) 
+  *)
   
 
   (* Get the configuration of executables *)
@@ -32,7 +35,7 @@ let full_run ?(start_dataserver=true) ezfio_filename  =
   if (start_dataserver) then
     begin
       (* Reset socket address in EZFIO *)
-      Ezfio.set_simulation_http_server "tcp://localhost:65534";
+      Ezfio.set_simulation_http_server "tcp://127.0.0.1:65534";
 
 
       (* Start the data server *)
@@ -64,7 +67,7 @@ let full_run ?(start_dataserver=true) ezfio_filename  =
            ZMQ.Socket.send socket (Message.(to_string Test));
            ZMQ.Socket.recv socket
          ) with
-       | Unix.Unix_error _ ->
+       | Unix.Unix_error (_,_,_) ->
            begin
              ZMQ.Socket.set_linger_period socket 1 ;
              ZMQ.Socket.close socket;