Suddenly our site is not working.It showing like this error*"Service Unavailable". What we will do . *Is their any solution for this.If you help anything we are appreciate you.
Service unavailable normally means that the Application Pool hosting theweb page has stopped working. Normally that's because the password ofthe AppPool identity account expired or was changed.
Change u r Application pool Pasword in IISor Password may by locked on AD or Expired.
You should never change a sharePoint AppPool password in IIS. You needto change it from the Operations Tab of Central Admin so the change ismade both to IIS and the SharePoint config database.