What does Windows error code 50 (ERROR_NOT_SUPPORTED) mean? Status / error code: Category: Constant name: Source: Operating System: Description: The request is not supported. Could be also: ConstantTypeOS KERN_CODESIGN_ERRORKern returnMac ippStsUnknownFeatureIntel Ipp StatusAny ENOCSIerrnoLinux ENETDOWNerrnoMac EBADEerrnoSolaris PHASE1_INITIALIZATION_FAILEDBugCheck CodeWindows Looking for a different code? Search another status or error code.