la aplicacion es excelente !!! pero tengo un problema, se actualizo el juego y la WebApi y ahora no me funciona el TELNET y WebApi del RAT !! espero que puedas solucionarlo.
Te dejo registro del error:
See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.NullReferenceException: Object reference not set to an instance of an object.
   at System.Net.Sockets.TcpClient.get_Connected()
   at RAT4.telnet.VB$StateMachine_28_connect.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at RAT4.Server.VB$StateMachine_22_Connect.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
   at RAT4.frmMain.VB$StateMachine_37_ServerConnect.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.GetResult()
   at RAT4.frmMain.VB$StateMachine_43_cbServerConnection_Click.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9181.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
RAT4
    Assembly Version: 1.0.0.0
    Win32 Version: 4.1.0.2
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/RAT4.exe
----------------------------------------
Microsoft.VisualBasic
    Assembly Version: 10.0.0.0
    Win32 Version: 14.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9206.0 built by: NET481REL1LAST_B
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Core
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9200.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Core/v4.0_4.0.0.0__b77a5c561934e089/System.Core.dll
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9181.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System.Drawing
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
System.Configuration
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll
----------------------------------------
System.Xml
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
System.Runtime.Remoting
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll
----------------------------------------
Telerik.WinControls.UI
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.UI.DLL
----------------------------------------
Telerik.WinControls
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.DLL
----------------------------------------
System.Data.SQLite
    Assembly Version: 1.0.118.0
    Win32 Version: 1.0.118.0
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.Data.SQLite.DLL
----------------------------------------
System.Data
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9191.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_64/System.Data/v4.0_4.0.0.0__b77a5c561934e089/System.Data.dll
----------------------------------------
System.Transactions
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_64/System.Transactions/v4.0_4.0.0.0__b77a5c561934e089/System.Transactions.dll
----------------------------------------
Telerik.WinControls.Scheduler
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.Scheduler.DLL
----------------------------------------
TelerikCommon
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/TelerikCommon.DLL
----------------------------------------
Telerik.WinControls.Themes.VisualStudio2022
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.Themes.VisualStudio2022.DLL
----------------------------------------
Microsoft.GeneratedCode
    Assembly Version: 1.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
Telerik.WinControls.GridView
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.GridView.DLL
----------------------------------------
Telerik.WinControls.RadToastNotification
    Assembly Version: 2023.2.718.48
    Win32 Version: 2023.2.718.48
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Telerik.WinControls.RadToastNotification.DLL
----------------------------------------
Microsoft.Toolkit.Uwp.Notifications
    Assembly Version: 7.0.0.0
    Win32 Version: 7.0.0.1
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Microsoft.Toolkit.Uwp.Notifications.DLL
----------------------------------------
Windows.ApplicationModel
    Assembly Version: 255.255.255.255
    Win32 Version: 10.0.10011.16384
    CodeBase: file:///C:/Windows/system32/WinMetadata/Windows.ApplicationModel.winmd
----------------------------------------
System.Runtime
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Runtime.dll
----------------------------------------
Windows.Foundation
    Assembly Version: 255.255.255.255
    Win32 Version: 10.0.10011.16384
    CodeBase: file:///C:/Windows/system32/WinMetadata/Windows.Foundation.winmd
----------------------------------------
System.Runtime.WindowsRuntime
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.WindowsRuntime/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.WindowsRuntime.dll
----------------------------------------
Windows.Storage
    Assembly Version: 255.255.255.255
    Win32 Version: 10.0.10011.16384
    CodeBase: file:///C:/Windows/system32/WinMetadata/Windows.Storage.winmd
----------------------------------------
DynamicComActivator
    Assembly Version: 0.0.0.0
    Win32 Version: 7.0.0.1
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Microsoft.Toolkit.Uwp.Notifications.dll
----------------------------------------
Windows.UI
    Assembly Version: 255.255.255.255
    Win32 Version: 10.0.10011.16384
    CodeBase: file:///C:/Windows/system32/WinMetadata/Windows.UI.winmd
----------------------------------------
System.Runtime.InteropServices.WindowsRuntime
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.InteropServices.WindowsRuntime/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Runtime.InteropServices.WindowsRuntime.dll
----------------------------------------
Discord.Net.Core
    Assembly Version: 3.12.0.0
    Win32 Version: 3.12.0.0
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Discord.Net.Core.DLL
----------------------------------------
System.EnterpriseServices
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_64/System.EnterpriseServices/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.EnterpriseServices.dll
----------------------------------------
Newtonsoft.Json
    Assembly Version: 13.0.0.0
    Win32 Version: 13.0.3.27908
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Newtonsoft.Json.DLL
----------------------------------------
System.Numerics
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Numerics/v4.0_4.0.0.0__b77a5c561934e089/System.Numerics.dll
----------------------------------------
System.Runtime.Serialization
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Serialization/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Serialization.dll
----------------------------------------
Accessibility
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll
----------------------------------------
Discord.Net.WebSocket
    Assembly Version: 3.12.0.0
    Win32 Version: 3.12.0.0
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Discord.Net.WebSocket.DLL
----------------------------------------
Microsoft.Bcl.AsyncInterfaces
    Assembly Version: 7.0.0.0
    Win32 Version: 7.0.22.51805
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Microsoft.Bcl.AsyncInterfaces.DLL
----------------------------------------
System.Collections.Immutable
    Assembly Version: 7.0.0.0
    Win32 Version: 7.0.22.51805
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.Collections.Immutable.DLL
----------------------------------------
Discord.Net.Rest
    Assembly Version: 3.12.0.0
    Win32 Version: 3.12.0.0
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/Discord.Net.Rest.DLL
----------------------------------------
System.Threading.Tasks.Extensions
    Assembly Version: 4.2.0.1
    Win32 Version: 4.6.28619.01
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.Threading.Tasks.Extensions.DLL
----------------------------------------
System.Net.Http
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9037.0 built by: NET481REL1
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Net.Http/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Net.Http.dll
----------------------------------------
System.ValueTuple
    Assembly Version: 4.0.3.0
    Win32 Version: 4.6.26515.06
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.ValueTuple.DLL
----------------------------------------
Anonymously Hosted DynamicMethods Assembly
    Assembly Version: 0.0.0.0
    Win32 Version: 4.8.9181.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_64/mscorlib/v4.0_4.0.0.0__b77a5c561934e089/mscorlib.dll
----------------------------------------
System.Linq.Async
    Assembly Version: 6.0.0.0
    Win32 Version: 6.0.1.35981
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.Linq.Async.DLL
----------------------------------------
System.Runtime.CompilerServices.Unsafe
    Assembly Version: 6.0.0.0
    Win32 Version: 6.0.21.52210
    CodeBase: file:///Z:/Programas/7D2D%20RAT%204/System.Runtime.CompilerServices.Unsafe.DLL
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
<configuration>
    <system.windows.forms jitDebugging="true" />
</configuration>
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.