Windows Error Codes
Searchable reference for Windows error codes — system errors, BSOD stop codes, NTSTATUS, WMI, RPC, MSI installer, AD/Kerberos, BitLocker, DNS, VPN, Hyper-V, COM/DCOM and more. Each entry includes the hex/decimal value, severity, root causes, and a step-by-step troubleshooting workflow.
How to read a Windows error code
Windows surfaces error codes through Win32, NTSTATUS, HRESULT, and many subsystem-specific spaces. Each code has a hex form (e.g. 0x80070005), a signed decimal form (-2147024891), and a symbolic name (ERROR_ACCESS_DENIED). This page lets you look up any of those forms, see what triggers the code, and follow a vetted troubleshooting workflow tuned for the originating subsystem (Windows Update, BSOD, AD/Kerberos, BitLocker, etc.).
228 codes
0x800700B7WarningERROR_ALREADY_EXISTS (WU)
Update file already exists. May indicate a partial previous download.
0x80070422ErrorERROR_SERVICE_DISABLED
Windows Update service is disabled. Enable and start the wuauserv service.
0x80070490ErrorERROR_NOT_FOUND (WU)
Element not found. Often a corrupt CBS store — run DISM /RestoreHealth.
0x800705B4ErrorERROR_TIMEOUT (WU)
Windows Update operation timed out. Check network connectivity and WSUS configuration.
0x8007052EErrorERROR_LOGON_FAILURE
Logon failure: unknown user name or bad password. Most common AD authentication error.
0x80070534ErrorERROR_NONE_MAPPED
No mapping between account names and security IDs was done. User/group not found in AD.
0x8007054BErrorERROR_DOMAIN_CONTROLLER_NOT_FOUND
Could not find the domain controller for this domain. DNS or network issue.
0x8007054FErrorERROR_DS_UNAVAILABLE
The directory service is unavailable. Domain controller is offline or unreachable.
0x80070569WarningERROR_LOGON_TYPE_NOT_GRANTED
A user has been denied the requested logon type at this machine. Check local/GPO logon rights.
0x80070774WarningERROR_ACCOUNT_LOCKED_OUT
The referenced account is currently locked out and cannot be logged on to.
0x800706BAErrorRPC_S_SERVER_UNAVAILABLE
The RPC server is unavailable. Check that the target machine is online and firewall allows RPC.
0x800706BBWarningRPC_S_SERVER_TOO_BUSY
The RPC server is too busy to complete this operation.
0x800706BEErrorRPC_S_CALL_FAILED
The remote procedure call failed. Network issue or service crash on remote end.
0x800706BFErrorRPC_S_CALL_FAILED_DNE
The remote procedure call failed and did not execute.
0x800706D9ErrorEPT_S_NOT_REGISTERED
No endpoint registered. The service on the remote machine is not running.
0x8007054FErrorERROR_INTERNAL_ERROR (WU)
An internal error occurred in Windows Update.
0x80072745ErrorWSAECONNABORTED
An established connection was aborted by the software in your host machine.
0x80072746ErrorWSAECONNRESET
An existing connection was forcibly closed by the remote host. VPN server dropped the connection.
0x80072AF9ErrorWSAHOST_NOT_FOUND
No such host is known. The hostname cannot be resolved via DNS.
0x80072AFCWarningWSANO_DATA
The requested name is valid, but no data of the requested type was found.
0x80072EE2ErrorWININET_E_TIMEOUT
The operation timed out. Check network connectivity and proxy settings.
0x80072EE7ErrorWININET_E_NAME_NOT_RESOLVED
The server name or address could not be resolved. DNS issue.
0x80072EFDErrorWININET_E_CANNOT_CONNECT
A connection with the server could not be established.
0x80072EFEErrorWININET_E_CONNECTION_ABORTED
The connection with the server was terminated abnormally.
0x80072EFFErrorWININET_E_CONNECTION_RESET
The connection with the server was reset.
0x80072F0CErrorWININET_E_INVALID_CA
The certificate authority is invalid or incorrect. SSL/TLS certificate issue.
0x80073701ErrorERROR_SXS_ASSEMBLY_MISSING
A required assembly is missing from the WinSxS store. Run DISM /RestoreHealth.
0x80090304ErrorSEC_E_INTERNAL_ERROR
The Local Security Authority cannot be contacted.
0x8009030CErrorSEC_E_LOGON_DENIED
The logon attempt failed. Kerberos logon denied.
0x8009030EErrorSEC_E_NO_CREDENTIALS
No credentials are available in the security package.