diff --git a/Source/SocketEngine.swift b/Source/SocketEngine.swift
index bae0613..1f914fc 100644
--- a/Source/SocketEngine.swift
+++ b/Source/SocketEngine.swift
@@ -24,17 +24,14 @@
 
 import Foundation
 
-public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollable, SocketEngineWebsocket {
+public final class SocketEngine: NSObject, SocketEnginePollable, SocketEngineWebsocket {
     public let emitQueue = dispatch_queue_create("com.socketio.engineEmitQueue", DISPATCH_QUEUE_SERIAL)
     public let handleQueue = dispatch_queue_create("com.socketio.engineHandleQueue", DISPATCH_QUEUE_SERIAL)
     public let parseQueue = dispatch_queue_create("com.socketio.engineParseQueue", DISPATCH_QUEUE_SERIAL)
 
-    public var invalidated = false
     public var postWait = [String]()
-    public var probing = false
     public var waitingForPoll = false
     public var waitingForPost = false
-    public var websocketConnected = false
     
     public private(set) var closed = false
     public private(set) var connected = false
@@ -43,8 +40,10 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
     public private(set) var fastUpgrade = false
     public private(set) var forcePolling = false
     public private(set) var forceWebsockets = false
+    public private(set) var invalidated = false
     public private(set) var pingTimer: NSTimer?
     public private(set) var polling = true
+    public private(set) var probing = false
     public private(set) var session: NSURLSession?
     public private(set) var sid = ""
     public private(set) var socketPath = "/engine.io"
@@ -171,6 +170,7 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
 
         pingTimer?.invalidate()
         closed = true
+        invalidated = true
         connected = false
 
         if websocket {
@@ -468,7 +468,6 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
         waitingForPoll = false
         waitingForPost = false
         websocket = false
-        websocketConnected = false
     }
     
     /// Send an engine message (4)
@@ -506,7 +505,7 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
     }
 
     private func upgradeTransport() {
-        if websocketConnected {
+        if ws?.isConnected ?? false {
             DefaultSocketLogger.Logger.log("Upgrading transport to WebSockets", type: logType)
 
             fastUpgrade = true
@@ -536,8 +535,6 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
     
     // Delagate methods
     public func websocketDidConnect(socket: WebSocket) {
-        websocketConnected = true
-        
         if !forceWebsockets {
             probing = true
             probeWebSocket()
@@ -549,7 +546,6 @@ public final class SocketEngine: NSObject, SocketEngineSpec, SocketEnginePollabl
     }
     
     public func websocketDidDisconnect(socket: WebSocket, error: NSError?) {
-        websocketConnected = false
         probing = false
         
         if closed {
diff --git a/Source/SocketEnginePollable.swift b/Source/SocketEnginePollable.swift
index 8a325b9..52d09d6 100644
--- a/Source/SocketEnginePollable.swift
+++ b/Source/SocketEnginePollable.swift
@@ -25,7 +25,7 @@
 import Foundation
 
 public protocol SocketEnginePollable: SocketEngineSpec {
-    var invalidated: Bool { get set }
+    var invalidated: Bool { get }
     var session: NSURLSession? { get }
     var waitingForPoll: Bool { get set }
     var waitingForPost: Bool { get set }
@@ -211,7 +211,6 @@ extension SocketEnginePollable {
     }
     
     public func stopPolling() {
-        invalidated = true
         session?.finishTasksAndInvalidate()
     }
 }
diff --git a/Source/SocketEngineSpec.swift b/Source/SocketEngineSpec.swift
index 11ed9a0..f00f967 100644
--- a/Source/SocketEngineSpec.swift
+++ b/Source/SocketEngineSpec.swift
@@ -37,8 +37,8 @@ import Foundation
     var parseQueue: dispatch_queue_t! { get }
     var pingTimer: NSTimer? { get }
     var polling: Bool { get }
-    var postWait: [String] { get set }
-    var probing: Bool { get set }
+    var postWait: [String] { get set } // Would like to change to get only
+    var probing: Bool { get } // Would like to change to get only
     var emitQueue: dispatch_queue_t! { get }
     var handleQueue: dispatch_queue_t! { get }
     var sid: String { get }
diff --git a/Source/SocketEngineWebsocket.swift b/Source/SocketEngineWebsocket.swift
index 8961592..53215c7 100644
--- a/Source/SocketEngineWebsocket.swift
+++ b/Source/SocketEngineWebsocket.swift
@@ -26,7 +26,6 @@
 import Foundation
 
 public protocol SocketEngineWebsocket: SocketEngineSpec, WebSocketDelegate {
-    var websocketConnected: Bool { get set }
     var ws: WebSocket? { get }
 
     func sendWebSocketMessage(str: String, withType type: SocketEnginePacketType, withData datas: [NSData])
@@ -35,7 +34,7 @@ public protocol SocketEngineWebsocket: SocketEngineSpec, WebSocketDelegate {
 // WebSocket methods
 extension SocketEngineWebsocket {
     func probeWebSocket() {
-        if websocketConnected {
+        if ws?.isConnected ?? false {
             sendWebSocketMessage("probe", withType: .Ping, withData: [])
         }
     }