File does not have the correct identifier

Hi, Recently met with an issue with WyUpdate ,which shows an error that " The downloaded server file does not have the correct identifier .This is usually caused by file corruption " . I am using HTTP for downloads . Good thing is that I can perform the download from the sever itself,but when I try to update from my client it shows above mentioned error.I can ping and even access shared folder from my client machine manually .Server and client belongs to the same domain.In a big trouble,Please help 😐 .