Error 401 administrator

Sorry this help is here for our extension JEM. For general help you have to ask your provider or Joomla.
But only to say Joomla 2.5 is finished more than one year.

it might be a problem caused by your hosting company.

some info:
www.ostraining.com/support-forum/joomla-support/problem-restoring-site/

I have a slightly similar problem. Could this be because the rate for hosting I have been already 4 years? Maybe the provider changed the settings. Or even something on the technical side..

Like just said: better to ask directly your hoster.