Getting "Access is denied. Check credentials and try again." error in Exchange Web Service in Exchange 2013

Hi, 

    I am using Exchange 2013 CU1 EWS to get the User (example,User1) oof Setting response using"GetUserOofSettings" web service Method, but I got the Error :"Access is denied. Check credentials and try again." 
 But I have passed correct domain Administrator credentials and also havepermission (-AccessRights ExtendedRight -ExtendedRights Receive-As,Send-As) on all mailbox database. Same code is successfully working on Exchange 2010 but does not work in Exchange 2013 CU1. 
   Can anybody please help me what exact the problem.

thanks in Advance.