diff --git a/client/scripts/network.js b/client/scripts/network.js
index efbd601..96dabd1 100644
--- a/client/scripts/network.js
+++ b/client/scripts/network.js
@@ -1,3 +1,6 @@
+window.URL = window.URL || window.webkitURL;
+window.isRtcSupported = !!(window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection);
+
 class ServerConnection {
 
     constructor() {
@@ -5,7 +8,6 @@ class ServerConnection {
         Events.on('beforeunload', e => this._disconnect());
         Events.on('pagehide', e => this._disconnect());
         document.addEventListener('visibilitychange', e => this._onVisibilityChange());
-
     }
 
     _connect() {
@@ -40,12 +42,12 @@ class ServerConnection {
                 this.send({ type: 'pong' });
                 break;
             default:
-                console.error('WS: unkown message type', msg)
+                console.error('WS: unkown message type', msg);
         }
     }
 
     send(message) {
-        if (this._socket.readyState !== this._socket.OPEN) return;
+        if (!this._isConnected()) return;
         this._socket.send(JSON.stringify(message));
     }
 
@@ -118,7 +120,7 @@ class Peer {
             type: 'header',
             name: file.name,
             mime: file.type,
-            size: file.size,
+            size: file.size
         });
         this._chunker = new FileChunker(file,
             chunk => this._send(chunk),
@@ -244,6 +246,7 @@ class RTCPeer extends Peer {
         this._conn = new RTCPeerConnection(RTCPeer.config);
         this._conn.onicecandidate = e => this._onIceCandidate(e);
         this._conn.onconnectionstatechange = e => this._onConnectionStateChange(e);
+        this._conn.oniceconnectionstatechange = e => this._onIceConnectionStateChange(e);
     }
 
     _openChannel() {
@@ -305,6 +308,16 @@ class RTCPeer extends Peer {
         }
     }
 
+    _onIceConnectionStateChange() {
+        switch (this._conn.iceConnectionState) {
+            case 'failed':
+                console.error('ICE Gathering failed');
+                break;
+            default:
+                console.log('ICE Gathering', this._conn.iceConnectionState);
+        }
+    }
+
     _onError(error) {
         console.error(error);
     }
@@ -398,8 +411,8 @@ class WSPeer {
 class FileChunker {
 
     constructor(file, onChunk, onPartitionEnd) {
-        this._chunkSize = 64000;
-        this._maxPartitionSize = 1e6;
+        this._chunkSize = 64000;      // 64 KB
+        this._maxPartitionSize = 1e6; // 1 MB
         this._offset = 0;
         this._partitionSize = 0;
         this._file = file;
@@ -466,7 +479,7 @@ class FileDigester {
         this.progress = this._bytesReceived / this._size;
         if (this._bytesReceived < this._size) return;
         // we are done
-        let received = new Blob(this._buffer, { type: this._mime }); 
+        let received = new Blob(this._buffer, { type: this._mime });
         let url = URL.createObjectURL(received);
         this._callback({
             name: this._name,
@@ -488,20 +501,13 @@ class Events {
     }
 }
 
-window.isRtcSupported = !!(window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection);
 
 RTCPeer.config = {
     'iceServers': [{
-        urls: 'stun:stun.stunprotocol.org:3478'
-    }, {
         urls: 'stun:stun.l.google.com:19302'
     }, {
-        urls: 'turn:turn.bistri.com:80',
-        credential: 'homeo',
-        username: 'homeo'
-    }, {
-        urls: 'turn:turn.anyfirewall.com:443?transport=tcp',
-        credential: 'webrtc',
-        username: 'webrtc'
+        urls: 'turn:192.158.29.39:3478?transport=tcp',
+        credential: 'JZEOEt2V3Qb0y27GRntt2u2PAYA=',
+        username: '28224511:1379330808'
     }]
 }
\ No newline at end of file
diff --git a/client/scripts/ui.js b/client/scripts/ui.js
index 8ef5251..ccb53f8 100644
--- a/client/scripts/ui.js
+++ b/client/scripts/ui.js
@@ -25,16 +25,16 @@ class PeersUI {
     }
 
     _onPeerLeft(peerId) {
-        const peer = $(peerId);
-        if (!peer) return;
-        peer.remove();
+        const $peer = $(peerId);
+        if (!$peer) return;
+        $peer.remove();
     }
 
     _onFileProgress(progress) {
         const peerId = progress.sender || progress.recipient;
-        const peer = $(peerId);
-        if (!peer) return;
-        peer.ui.setProgress(progress.progress);
+        const $peer = $(peerId);
+        if (!$peer) return;
+        $peer.ui.setProgress(progress.progress);
     }
 
     _clearPeers() {
@@ -237,7 +237,7 @@ class ReceiveDialog extends Dialog {
         this.show();
 
         if (window.isDownloadSupported) return;
-        $a.target = "_blank"; // fallback
+        // $a.target = "_blank"; // fallback
     }
 
     _formatFileSize(bytes) {
diff --git a/server/index.js b/server/index.js
index f231651..4c02151 100644
--- a/server/index.js
+++ b/server/index.js
@@ -4,9 +4,7 @@ class SnapdropServer {
 
     constructor(port) {
         const WebSocket = require('ws');
-        this._wss = new WebSocket.Server({
-            port: port
-        });
+        this._wss = new WebSocket.Server({ port: port });
         this._wss.on('connection', (socket, request) => this._onConnection(new Peer(socket, request)));
         this._wss.on('headers', (headers, response) => this._onHeaders(headers, response));
 
@@ -57,7 +55,6 @@ class SnapdropServer {
             this._rooms[peer.ip] = {};
         }
 
-        // console.log(peer.id, ' joined the room', peer.ip);
         // notify all other peers
         for (const otherPeerId in this._rooms[peer.ip]) {
             const otherPeer = this._rooms[peer.ip][otherPeerId];
@@ -97,10 +94,7 @@ class SnapdropServer {
             // notify all other peers
             for (const otherPeerId in this._rooms[peer.ip]) {
                 const otherPeer = this._rooms[peer.ip][otherPeerId];
-                this._send(otherPeer, {
-                    type: 'peer-left',
-                    peerId: peer.id
-                });
+                this._send(otherPeer, { type: 'peer-left', peerId: peer.id });
             }
         }
     }
@@ -109,7 +103,7 @@ class SnapdropServer {
         if (!peer) return console.error('undefined peer');
         if (this._wss.readyState !== this._wss.OPEN) return console.error('Socket is closed');
         message = JSON.stringify(message);
-        peer.socket.send(message, error => console.log(error));
+        peer.socket.send(message, error => error ? console.log(error): '');
     }
 
     _keepAlive(peer) {
@@ -145,24 +139,55 @@ class Peer {
 
 
         // set remote ip
-        if (request.headers['x-forwarded-for'])
-            this.ip = request.headers['x-forwarded-for'].split(/\s*,\s*/)[0];
-        else
-            this.ip = request.connection.remoteAddress;
+        this._setIP(request);
 
+        // set peer id
+        this._setPeerId(request)
+        // is WebRTC supported ?
+        this.rtcSupported = request.url.indexOf('webrtc') > -1;
+        // set name 
+        this._setName(request);
+        // for keepalive
+        this.timerId = 0;
+        this.lastBeat = Date.now();
+    }
+
+    _setIP(request) {
+        if (request.headers['x-forwarded-for']) {
+            this.ip = request.headers['x-forwarded-for'].split(/\s*,\s*/)[0];
+        } else {
+            this.ip = request.connection.remoteAddress;
+        }
+    }
+
+    _setPeerId(request) {
         if (request.peerId) {
             this.id = request.peerId;
         } else {
             this.id = request.headers.cookie.replace('peerid=', '');
         }
-        // set peer id
-        // is WebRTC supported ?
-        this.rtcSupported = request.url.indexOf('webrtc') > -1;
-        // set name 
-        this.setName(request);
-        // for keepalive
-        this.timerId = 0;
-        this.lastBeat = Date.now();
+    }
+
+    toString() {
+        return `<Peer id=${this.id} ip=${this.ip} rtcSupported=${this.rtcSupported}>`
+    }
+
+    _setName(req) {
+        var ua = parser(req.headers['user-agent']);
+        this.name = {
+            model: ua.device.model,
+            os: ua.os.name,
+            browser: ua.browser.name,
+            type: ua.device.type
+        };
+    }
+
+    getInfo() {
+        return {
+            id: this.id,
+            name: this.name,
+            rtcSupported: this.rtcSupported
+        }
     }
 
     // return uuid of form xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
@@ -190,28 +215,6 @@ class Peer {
         }
         return uuid;
     };
-
-    toString() {
-        return `<Peer id=${this.id} ip=${this.ip} rtcSupported=${this.rtcSupported}>`
-    }
-
-    setName(req) {
-        var ua = parser(req.headers['user-agent']);
-        this.name = {
-            model: ua.device.model,
-            os: ua.os.name,
-            browser: ua.browser.name,
-            type: ua.device.type
-        };
-    }
-
-    getInfo() {
-        return {
-            id: this.id,
-            name: this.name,
-            rtcSupported: this.rtcSupported
-        }
-    }
 }
 
 const server = new SnapdropServer(process.env.PORT || 3000);
\ No newline at end of file