BizTalk 2020 Service Bus connectivity issue

Question

Problem: BizTalk receives this error when sending message to Azure Service Bus:

"System.ServiceModel.CommunicationException: The socket connection was aborted. This could be caused by an error processing your message or a receive timeout being exceeded by the remote host, or an underlying network resource issue. Local socket timeout was '00:00:37.6349347'. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host"

Setup: BizTak 2020 on an Azure VM with CU5.

The adapter SB-Messaging gets this error when we want to send messages to the service bus, receiving messages from the service bus with the SB adapter nothing happens no errors nothing.

We tested the connectivity to the queue with a powershell script that pushes messages to the queue with the command 'Invoke-WebRequest' works fine. same for custom C# script.

Can someone assist us with the problem?

If wanted I can send more details.

Thanks