diff --git a/Core/Core.vcxproj b/Core/Core.vcxproj
index 20dd7542..1fbcb7e6 100644
--- a/Core/Core.vcxproj
+++ b/Core/Core.vcxproj
@@ -370,6 +370,7 @@
     <ClInclude Include="FDS.h" />
     <ClInclude Include="FdsAudio.h" />
     <ClInclude Include="FdsLoader.h" />
+    <ClInclude Include="ForceDisconnectMessage.h" />
     <ClInclude Include="HdVideoFilter.h" />
     <ClInclude Include="iNesLoader.h" />
     <ClInclude Include="IremH3001.h" />
diff --git a/Core/Core.vcxproj.filters b/Core/Core.vcxproj.filters
index f0a30f19..5fa0d3fa 100644
--- a/Core/Core.vcxproj.filters
+++ b/Core/Core.vcxproj.filters
@@ -545,6 +545,9 @@
     <ClInclude Include="SelectControllerMessage.h">
       <Filter>NetPlay\Messages</Filter>
     </ClInclude>
+    <ClInclude Include="ForceDisconnectMessage.h">
+      <Filter>NetPlay\Messages</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
diff --git a/Core/EmulationSettings.cpp b/Core/EmulationSettings.cpp
index 7bebd9f5..50f8f1ce 100644
--- a/Core/EmulationSettings.cpp
+++ b/Core/EmulationSettings.cpp
@@ -17,6 +17,10 @@ uint32_t EmulationSettings::PpuPaletteArgb[64] = {
 	0xFFB5EBF2, 0xFFB8B8B8, 0xFF000000, 0xFF000000,
 };
 
+uint16_t EmulationSettings::_versionMajor = 0;
+uint8_t EmulationSettings::_versionMinor = 1;
+uint8_t EmulationSettings::_versionRevision = 0;
+
 uint32_t EmulationSettings::_flags = 0;
 
 uint32_t EmulationSettings::_audioLatency = 20000;
diff --git a/Core/EmulationSettings.h b/Core/EmulationSettings.h
index 1ca1703c..8b8b4766 100644
--- a/Core/EmulationSettings.h
+++ b/Core/EmulationSettings.h
@@ -143,6 +143,11 @@ struct KeyMappingSet
 class EmulationSettings
 {
 private:
+	//Version 0.1.0
+	static uint16_t _versionMajor;
+	static uint8_t _versionMinor;
+	static uint8_t _versionRevision;
+
 	static uint32_t PpuPaletteArgb[64];
 	static uint32_t _flags;
 
@@ -170,12 +175,12 @@ private:
 public:
 	static uint32_t GetMesenVersion()
 	{
-		//Version 0.1.0
-		uint16_t major = 0;
-		uint8_t minor = 1;
-		uint8_t revision = 0;
+		return (_versionMajor << 16) | (_versionMinor << 8) | _versionRevision;
+	}
 
-		return (major << 16) | (minor << 8) | revision;
+	static string GetMesenVersionString()
+	{
+		return std::to_string(_versionMajor) + "." + std::to_string(_versionMinor) + "." + std::to_string(_versionRevision);
 	}
 
 	static void SetFlags(EmulationFlags flags)
diff --git a/Core/ForceDisconnectMessage.h b/Core/ForceDisconnectMessage.h
new file mode 100644
index 00000000..894bd16a
--- /dev/null
+++ b/Core/ForceDisconnectMessage.h
@@ -0,0 +1,33 @@
+#pragma once
+#include "stdafx.h"
+#include "MessageManager.h"
+#include "NetMessage.h"
+#include "Console.h"
+#include "RomLoader.h"
+#include "../Utilities/FolderUtilities.h"
+
+class ForceDisconnectMessage : public NetMessage
+{
+private:
+	char* _disconnectMessage = nullptr;
+	uint32_t _messageLength = 0;
+
+protected:
+	virtual void ProtectedStreamState()
+	{
+		StreamArray((void**)&_disconnectMessage, _messageLength);
+	}
+
+public:
+	ForceDisconnectMessage(void* buffer, uint32_t length) : NetMessage(buffer, length) { }
+
+	ForceDisconnectMessage(string message) : NetMessage(MessageType::ForceDisconnect)
+	{
+		CopyString(&_disconnectMessage, _messageLength, message);
+	}
+
+	string GetMessage()
+	{
+		return _disconnectMessage;
+	}
+};
\ No newline at end of file
diff --git a/Core/GameClientConnection.cpp b/Core/GameClientConnection.cpp
index c52aa140..0bda8677 100644
--- a/Core/GameClientConnection.cpp
+++ b/Core/GameClientConnection.cpp
@@ -12,6 +12,7 @@
 #include "StandardController.h"
 #include "SelectControllerMessage.h"
 #include "PlayerListMessage.h"
+#include "ForceDisconnectMessage.h"
 
 GameClientConnection::GameClientConnection(shared_ptr<Socket> socket, shared_ptr<ClientConnectionData> connectionData) : GameConnection(socket, connectionData)
 {
@@ -76,6 +77,10 @@ void GameClientConnection::ProcessMessage(NetMessage* message)
 			}
 			break;
 
+		case MessageType::ForceDisconnect:
+			MessageManager::DisplayMessage("Net Play", ((ForceDisconnectMessage*)message)->GetMessage());
+			break;
+
 		case MessageType::PlayerList:
 			_playerList = ((PlayerListMessage*)message)->GetPlayerList();
 			break;
diff --git a/Core/GameConnection.cpp b/Core/GameConnection.cpp
index 1cab2c29..910b3c33 100644
--- a/Core/GameConnection.cpp
+++ b/Core/GameConnection.cpp
@@ -8,6 +8,7 @@
 #include "PlayerListMessage.h"
 #include "SelectControllerMessage.h"
 #include "ClientConnectionData.h"
+#include "ForceDisconnectMessage.h"
 
 GameConnection::GameConnection(shared_ptr<Socket> socket, shared_ptr<ClientConnectionData> connectionData)
 {
@@ -58,6 +59,7 @@ NetMessage* GameConnection::ReadMessage()
 			case MessageType::GameInformation: return new GameInformationMessage(_messageBuffer, messageLength);
 			case MessageType::PlayerList: return new PlayerListMessage(_messageBuffer, messageLength);
 			case MessageType::SelectController: return new SelectControllerMessage(_messageBuffer, messageLength);
+			case MessageType::ForceDisconnect: return new ForceDisconnectMessage(_messageBuffer, messageLength);
 		}
 	}
 	return nullptr;
@@ -70,6 +72,11 @@ void GameConnection::SendNetMessage(NetMessage &message)
 	_socketLock.Release();
 }
 
+void GameConnection::Disconnect()
+{
+	_socket->Close();
+}
+
 bool GameConnection::ConnectionError()
 {
 	return _socket->ConnectionError();
diff --git a/Core/GameConnection.h b/Core/GameConnection.h
index ba233014..ad7e94a3 100644
--- a/Core/GameConnection.h
+++ b/Core/GameConnection.h
@@ -31,6 +31,9 @@ private:
 
 	virtual void ProcessMessage(NetMessage* message) = 0;
 
+protected:
+	void Disconnect();
+
 public:
 	static const uint8_t SpectatorPort = 0xFF;
 	GameConnection(shared_ptr<Socket> socket, shared_ptr<ClientConnectionData> connectionData);
diff --git a/Core/GameServerConnection.cpp b/Core/GameServerConnection.cpp
index 847a9a37..bd97030d 100644
--- a/Core/GameServerConnection.cpp
+++ b/Core/GameServerConnection.cpp
@@ -14,6 +14,7 @@
 #include "SelectControllerMessage.h"
 #include "PlayerListMessage.h"
 #include "GameServer.h"
+#include "ForceDisconnectMessage.h"
 
 GameServerConnection* GameServerConnection::_netPlayDevices[4] = { nullptr,nullptr,nullptr,nullptr };
 
@@ -28,8 +29,6 @@ GameServerConnection::~GameServerConnection()
 {
 	if(_connectionData) {
 		MessageManager::DisplayToast("Net Play", _connectionData->PlayerName + " (Player " + std::to_string(_controllerPort + 1) + ") disconnected.", _connectionData->AvatarData, _connectionData->AvatarSize);
-	} else {
-		MessageManager::DisplayMessage("Net Play", "Player " + std::to_string(_controllerPort + 1) + " disconnected.");
 	}
 
 	UnregisterNetPlayDevice(this);
@@ -54,6 +53,13 @@ void GameServerConnection::SendMovieData(uint8_t state, uint8_t port)
 	}
 }
 
+void GameServerConnection::SendForceDisconnectMessage(string disconnectMessage)
+{
+	ForceDisconnectMessage message(disconnectMessage);
+	SendNetMessage(message);
+	Disconnect();
+}
+
 void GameServerConnection::PushState(uint32_t state)
 {
 	if(_inputData.size() == 0 || state != _inputData.back()) {
@@ -96,6 +102,9 @@ void GameServerConnection::ProcessHandshakeResponse(HandShakeMessage* message)
 		RegisterNetPlayDevice(this, _controllerPort);
 		GameServer::SendPlayerList();
 		Console::Resume();
+	} else {
+		SendForceDisconnectMessage("Server is using a different version of Mesen (" + EmulationSettings::GetMesenVersionString() + ") - you have been disconnected.");
+		MessageManager::DisplayMessage("Net Play", message->GetPlayerName() + " is not running the same version of Mesen and has been disconnected");
 	}
 }
 
diff --git a/Core/GameServerConnection.h b/Core/GameServerConnection.h
index 9e0521d9..efeffc4c 100644
--- a/Core/GameServerConnection.h
+++ b/Core/GameServerConnection.h
@@ -20,6 +20,8 @@ private:
 	void SendGameInformation();
 	void SelectControllerPort(uint8_t port);
 
+	void SendForceDisconnectMessage(string disconnectMessage);
+
 	void ProcessHandshakeResponse(HandShakeMessage* message);
 
 	static void RegisterNetPlayDevice(GameServerConnection* connection, uint8_t port);
diff --git a/Core/HandShakeMessage.h b/Core/HandShakeMessage.h
index f55e4665..f01e62c0 100644
--- a/Core/HandShakeMessage.h
+++ b/Core/HandShakeMessage.h
@@ -1,11 +1,13 @@
 #pragma once
 #include "stdafx.h"
 #include "NetMessage.h"
+#include "EmulationSettings.h"
 
 class HandShakeMessage : public NetMessage
 {
 private:
 	const static int CurrentVersion = 1;
+	uint32_t _mesenVersion = 0;
 	uint32_t _protocolVersion = CurrentVersion;
 	char* _playerName = nullptr;
 	uint32_t _playerNameLength = 0;
@@ -16,6 +18,7 @@ private:
 protected:
 	virtual void ProtectedStreamState()
 	{
+		Stream<uint32_t>(_mesenVersion);
 		Stream<uint32_t>(_protocolVersion);
 		StreamArray((void**)&_playerName, _playerNameLength);
 		StreamArray(&_avatarData, _avatarSize);
@@ -26,13 +29,14 @@ public:
 	HandShakeMessage(void* buffer, uint32_t length) : NetMessage(buffer, length) { }
 	HandShakeMessage(string playerName, uint8_t* avatarData, uint32_t avatarSize, bool spectator) : NetMessage(MessageType::HandShake)
 	{
-		_protocolVersion = 1;
+		_mesenVersion = EmulationSettings::GetMesenVersion();
+		_protocolVersion = HandShakeMessage::CurrentVersion;
 		CopyString(&_playerName, _playerNameLength, playerName);
 		_avatarSize = avatarSize;
 		_avatarData = avatarData;
 		_spectator = spectator;
 	}
-	
+
 	string GetPlayerName()
 	{
 		return string(_playerName);
@@ -50,7 +54,7 @@ public:
 
 	bool IsValid()
 	{
-		return _protocolVersion == CurrentVersion;
+		return _protocolVersion == CurrentVersion && _mesenVersion == EmulationSettings::GetMesenVersion();
 	}
 
 	bool IsSpectator()
diff --git a/Core/MessageType.h b/Core/MessageType.h
index 99d03822..901e244e 100644
--- a/Core/MessageType.h
+++ b/Core/MessageType.h
@@ -10,4 +10,5 @@ enum class MessageType : uint8_t
 	GameInformation = 4,
 	PlayerList = 5,
 	SelectController = 6,
+	ForceDisconnect = 7
 };
\ No newline at end of file