”Connection to the server failed or was dropped.” Error Code 17895”

i m using Mac office 2011 on Mac OS X Mountain lion , version 14.3.2,  Configured POP account, all of sudden unable to receive email ,where as  can send email . tried to reconfigure email and able to receive emails available on main server  up to 999 but after this following Error appear'' Connection to the server failed or was dropped.'' Error Code 17895. Please help , i am in deep in trouble