Hi HeinReyneke,
try to use the port 8888 which is the default port for connecting (which differs from the the UI port)
This url should give an XML:
http://<SiS ip address>:8888/SiteScope/cgi/go.exe/SiteScope?page=topaz&operation=config&account=administrator
If so, then the LR connection should work also.
Goos luck ;-)
Regards,
Aurél