Multisite with 2 wordpress sites

I have a perf2014x2 web hosting using multisite with two domains and two WP installations, one in www and the other in www/eu

My issue is that it seems to be a long time that my second site is not accessible and I can't access via the 'cluster...' link as that is used for the first site. I would like to know if it is possible to access the WP backend of the send site somehow to check the site URL in WP.