HTTP GET and HTTP 401 error on test document transmission


I have a general question. When a trading partner perform a HTTP GET on the URL/IP address we provided to them for our AS2 connection they are brought to web page with the below: Is this normal?

Mendelson Opensource AS2 1.1 build 57
You have performed an HTTP GET on this URL.
To submit an AS2 message, you must POST the message to this URL

Also we were able to connect to our trading partner on the test connection, however when we try to send them a test file we get an error of:

A connection has been established to your trading partner hot - a webserver is running there
Anyway the remote server signals that something was wrong with the request path or port and returns the HTTP code of 401

We assigned the correct port that our trading partner provided. Can someone please help with this.