Backend has vanished - Joomla! Forum - community, help and support

this weird! unable bring backend of joomla site!!! i've tried numerous browsers , different computers of them revert home page (no error messages). can still login via frontend however. has come across before?

http://www.australianroadcrew.com.au/administrator

you have plugin requires provide hash in url in order access backend. admintools has functionality, few other extensions. try disabling admintools phpmyadmin if have access (and, of course, if admintools culprit).