We've got several customers who access the VisualRF APIs. One thing to check when you try to access the VisualRF API is that the program is using a valid user with a valid role. Also, be sure that your app also uses https/http according to your AMP settings. One way to trace the access is to watch the AMP's web server logs to make sure your program is getting past both web servers. AMP uses the web server 'pound' for initial login, then apache for the rest of AMP's activities. You may find some helpful messages in the /var/log/pound and /var/log/httpd/access_log.