Vb.net socket long receive timeout not working

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.NET

after sending a TCP packet to a slave board, I need to wait indefinitely for an answer. I am using Windows 10 Pro, Visual Studio 2022 and I am using a VB project with the function below (Running on a different thread then the main program)

The parameter gSocket.ReceiveTimeout = -1 does not have any influence on the exception time. If the board answers in less than 12 seconds, all runs well. It if takes more than 12 seconds, a Socket timeout exception is thrown, independent of the gSocket.ReceiveTimeout value. Even when it is set to 0 or -1 ...(Infinite time). Any suggestions ? Thanks !!!

Dim gSocket As Socket
gSocket = New Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp)


gSocket.ExclusiveAddressUse = True
gSocket.LingerState = New LingerOption(True, 10)
gSocket.NoDelay = True

'Connect.
Try

gSocket.Connect(vEndPoint)

gSocket.SendTimeout = -1
gSocket.Send(pSendData)

'Receive response.
Dim vBuffer(20) As Byte
For i = 0 To 19
vBuffer(i) = 0
Next
Dim vNumOfBytesReceived As Integer = 0
gSocket.ReceiveTimeout = -1
vNumOfBytesReceived = gSocket.Receive(vBuffer, 0, 20, SocketFlags.None)

gSocket.Disconnect(True)

Catch ex As Exception
MsgBox(ex.Message)
End Try

What I have tried:

I have tried all solutions I know, but I have never been able to extend the timeout of the receive TCP packet command. I need it to keep waiting for al least 3 minutes. But after 12 seconds it always throws an exception.