Plesk:
If You see the Tomcat icon, do not click on it. That takes you to Plesk's
default Java Application server support on a shared JVM.
You should click the NGASI Appserver Manager icon 
, which may be under
the custom button section in your domain view.
Make sure the FTP User for the domain is set as the
"Application Server Default System User" assigned by your Administrator.
Then click the "NGASI AppServer Manager" icon to access NGASI.
Also check with your Administrator that the user was assigned access to
NGASI AppServer Manager.
NOTE: Make sure the FTP User Password does not contain #