R12.1.3 Receivables: Autoinvoice gives error "The web server returned an error"

Tonight with this MOS article "Autoinvoice Import Errors with The web server returned an error" from document ID 2053754.1 it is important to notice that this affects the Autoinvoice Import (RAXTRX) AND Master (RAXMTR) programs with an unknown cause so it could happen at any time in your environment at a time you could not afford to bounce Apache services!