Unity Master Server Connect to own Server won't work

Hi everyone!

A standard Peer to Peer connection worked for me most of the time but for my current project I need the Unity Master Server. So I just started using it and the connection seems to work well. I'm able to create a server, register it and get the server list. But when I want to connect to the server I created I get the following error: "The connection request to 192.168.x.xxx:3000 failed. Are you sure the server can be connected to?"

I have to mention that I just started the Play Mode in Unity and ran a server. While being in this play mode session I refreshed host list and wanted to connect to exactly the server I created just a few seconds before.

So is it maybe impossible to connect to the server I'm running? That would be bad because I want to create 1vs1 sessions where the creator is the host of the match.

I also see that the IP displayed in my console is my LAN IP. But all in all I want to connect from mobile devices (connection allowed to both WLAN and mobile internet).

Again: Everything else works. The connection to the master server works fine and creating a server won't throw me an error. Just using the "Network.Connect"-Function throws the message above to my console.

Maybe I don't understand something regarding networking games so I'm very thankful for your help in advance!

Here is my connection code:

 void Awake(){
         Instance = this;
         // Set IP and Port of the Master Server
         MasterServer.ipAddress = this.MasterServerIP;
         MasterServer.port = this.MasterServerPort;
 
         // Facilitator is neccessary for NAT punchthrough
         Network.natFacilitatorIP = this.MasterServerIP;
         Network.natFacilitatorPort = this.FacilitatorPort;
     }
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
         
     }
 
     void OnGUI(){
         if(GUILayout.Button("Launch Server")){
             LaunchServer();
         }
         if(GUILayout.Button("Refresh")){
             print ("Pressed Refresh");
             RefreshHosts();
         }
 
         if(loadingServerList){
             GUILayout.Label("Loading...");
         }
         else{
             scrollPosition = GUILayout.BeginScrollView(scrollPosition, GUILayout.Width(200f), GUILayout.Height(200f));
 
             HostData[] hosts = MasterServer.PollHostList();
             for(int i = 0; i < hosts.Length; i++){
                 if(GUILayout.Button(hosts[i].gameName, GUILayout.ExpandWidth(true))){
                     print("Have public adress? " + Network.HavePublicAddress());
                     Network.Connect(hosts[i],);
                 }
             }
             if(hosts.Length == 0){
                 //print ("No Servers");
                 GUILayout.Label("No Servers running");
             }
             GUILayout.EndScrollView();
         }
     }
 
     void LaunchServer(){
 
         print("Have public adress? " + Network.HavePublicAddress());
         Network.InitializeServer(2, this.MasterServerPort, true);
         MasterServer.RegisterHost(this.GameType, "TestArenaServer", "thisIsATest");
     }
 
     void OnServerInitialized(){
         Debug.Log ("Server initialized");
     }
 
     void OnConnectedToServer(){
         print ("Connected to Server");
         NetworkLevelLoader.Instance.LoadLevel("MPArena");
     }
 
     void RefreshHosts(){
         loadingServerList = true;
         print ("Refreshing from Master Server at IP: " + this.MasterServerIP + ", Port: " + this.MasterServerPort);
         MasterServer.ClearHostList();
         MasterServer.RequestHostList(this.GameType);
     }
 
     void OnMasterServerEvent(){
         // received Host list
         print ("Finished!");
         loadingServerList = false;
     }

Best regards

Mischaal