windows Mono UPNP issue. Windows 2016

[Shad0wGeneral]

Having a Server Manager crash related to what I'm assuming is Mono having issues with UPNP.

Would anyone happen to know a fix for this other then opening all the required ports for TCAdmin directly?

System.ApplicationException: Date and Time:         27/01/2022 12:11:29 AM
Machine Name:          WIN-EJO0GCBDHM6
IP Address:            192.168.1.111
Current User:          Administrator

Application Domain:    TCAdminServiceManager.exe
Assembly Codebase:     file:///C:/Program Files/TCAdmin2/Monitor/TCAdminServiceManager.exe
Assembly Full Name:    TCAdminServiceManager, Version=2.0.0.0, Culture=neutral, PublicKeyToken=336a280da999c339
Assembly Version:      2.0.0.0
Assembly Build Date:   22/12/2021 11:05:56 AM

Exception Source:      Mono.Nat
Exception Type:        System.OverflowException
Exception Message:     System.OverflowException: Arithmetic operation resulted in an overflow.
   at Mono.Nat.Pmp.PmpNatDevice.CreatePortMapListen(Object obj)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
   at System.Threading.ThreadPoolWorkQueue.Dispatch()
Exception Target Site: CreatePortMapListen

---- Stack Trace ----
   Mono.Nat.Pmp.PmpNatDevice.CreatePortMapListen(obj As Object)
       TCAdminServiceManager.exe: N 00589
   System.Threading.ExecutionContext.RunInternal(executionContext As ExecutionContext, callback As ContextCallback, state As Object, preserveSyncCtx As Boolean)
       TCAdminServiceManager.exe: N 00355
   System.Threading.ExecutionContext.Run(executionContext As ExecutionContext, callback As ContextCallback, state As Object, preserveSyncCtx As Boolean)
       TCAdminServiceManager.exe: N 00020
   System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem()
       TCAdminServiceManager.exe: N 00115
   System.Threading.ThreadPoolWorkQueue.Dispatch()
       TCAdminServiceManager.exe: N 00338