we currently have a problem with host "singer", which did not come back after upgrading it. :(
The following services are not accessible :/
secure.wikimedia.org (SSL proxy), ocs.wikimania2009.wikimedia.org, contacts, outreachcivi, planet, racktables, secure, survey wm09schols, wm10reg, wm10schols.
http://wikitech.wikimedia.org/view/Singer
will send another update...we are still looking at it..