Error sending message to Mule API from BizTalk

Question

I am trying to post a message to Mule service, which is expected to respond with Success or Error Response. When I post a request directly to the Mule API using Postman, it gives a response as 200 with some HTML content. When I am pushing the same request with similar headers from BizTalk send port, I get the following error:

An error occurred while processing the message, refer to the details section for more information Message ID: {56AF4477-590F-415E-9D70-536692FE637C} Instance ID: {20EEC344-3B1A-474E-ACEB-160CBF616775} Error Description: System.ServiceModel.CommunicationException: An error occurred while receiving the HTTP response to https://. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down). See server logs for more details. ---> System.Net.WebException: The underlying connection was closed: An unexpected error occurred on a receive. ---> System.IO.IOException: Unable to read data from the transport connection: An existing connection was forcibly closed by the remote host. ---> System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host at System.Net.Sockets.Socket.EndReceive(IAsyncResult asyncResult) at System.Net.Sockets.NetworkStream.EndRead(IAsyncResult asyncResult) --- End of inner exception stack trace --- at System.Net.Security._SslStream.EndRead(IAsyncResult asyncResult) at System.Net.TlsStream.EndRead(IAsyncResult asyncResult) at System.Net.Connection.ReadCallback(IAsyncResult asyncResult) --- End of inner exception stack trace --- at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult) at System.ServiceModel.Channels.HttpChannelFactory1.HttpRequestChannel.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result) --- End of inner exception stack trace --- Server stack trace: at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result) at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result) at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result) at System.ServiceModel.Channels.ServiceChannel.EndRequest(IAsyncResult result) Exception rethrown at [0]: at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg) at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type) at System.ServiceModel.Channels.IRequestChannel.EndRequest(IAsyncResult result) at Microsoft.BizTalk.Adapter.Wcf.Runtime.WcfClient2.RequestCallback(IAsyncResult result)

This call from the BizTalk interface to Mule API was working fine until yesterday. I have tried using Fiddler to see the HTTP traffic from the BizTalk server. It shows the handshake with the Mule service, but no further information on headers or the request body. Please help.

UPDATE

When I posted the request directly to the Mule Api from another machine, it gave a proper response. This seems like a network issue, some rules may have been modified to allow traffic from specific servers. Waiting for the network team to confirm.