HTTP Error 503: Service unavailable when testing CDX Realtime Service on Dynamic AX 2012 R3 CU8
The syntax above raise when test CDX Realtime Service on IIS
The Solution is :
Try check your account name for running service CDX Realtime (Length of account shouldn't exceeds (20)
example : DevRealTimeServiceAcc (21)
thil will cause an error when we browse Realtime Service In IIS with the account by example, because the system only read (20 char) whic is DevRealTimeServiceAc