Is it a 404 error? If so, because the service is not installed/listening.
What version of LUA? What this an upgrade or fresh install? My just need to reinstall.
Similar issues here:
https://www-secure.symantec.com/connect/forums/lua-web-page-cannot-found
https://www-secure.symantec.com/connect/forums/symantec-lua-console-gets-webpage-cannot-be-found-error