To prevent Google and other search engines of indexing Gateway / portal. the robots.txt on the server has to be adjusted or created.
/opt/tarantella/webserver/apache/2.2.25_openssl-1.0.0k_jk1.2.37/htdocs/robots.txt
With the following setting, the site will be excluded from indexing:
# Exclude site from all robots
User-agent: *
Disallow: /