I was able to get UltraVNC working with my SA-2500.
I am running 7.0R4
The first thing I did was to download the VncViewer.zip package from my Server host that is actually running VNC Server.
Save the file, which will actually have a filename of VncViwer.zip in a directory where you can locate it.
Upload the VncViewer.zip file to the SA box
To do this create a resource profile, ensure that is a Hosted Java Applet
Name it and add a description
Click on Edit List to add the Java Applet
Click on New Applet and upload the VncViwer.zip, make sure "Uncompress archive file" is not checked or it wont load
Create a resource profile for Terminal Services (click on resource profiles, choose Terminal Services)
Leave it as Windows Terminal Servcies
Enter the host, in my case it was 172.16.1.26
change server port to 5900
check "Create an access control policy allowing Terminal Service access to this server."
check "Enable Java support"
under applet to use, make sure you select the App you upladed to the SA box
This should create an HTML file for you
ensure to add the following two parameters to the HTML file
<param name="PORT" value="5900"> <param name="HOST" value="172.16.1.26">
check the radio button "Always use this Java applet."
Save your changes
Next add the roles that you wish to have access
Click to continue and a bookmark will automatically be created for you.
I left everything default in the bookmark.
After that, it was done, worked perfectly for me.
Hope this helps.