hi please help me...my phone have error "unable connect to server" why?? how i can sove this problem?

im using samsung galxy sii, after buy it..i download facebook from market..its really useful.have to use it around 3 weeks but suddenly all application which have internet connection get this error.my mail also cant refresh like usually...can u help me? im using digi network,labuan malaysia

hi i still not get the answer..why my sii cant open app which using internet connectio..i use digi..before this no problem with it..i cant open market too...pless help me