RSE4008: Communication error [SYS%1: %2] occurred while writing response to client of backend server '%3' in backend farm '%4' when '%5'

Error code 4008
Error constant RSE_CLIENT_WRITE_FAIL
Parameter 1 System error code if any, otherwise 0
Parameter 2 System error message if any, otherwise NULL
Parameter 3 Backend server name
Parameter 4 Backend farm name
Parameter 5 Internal context
 Probable cause