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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.).

All categories System errors Windows Update BSOD stop NT Status AD / Kerberos RPC / Network WMI MSI Installer Office activation BitLocker DNS VPN / Remote Hyper-V COM / DCOM

Severity:All severities Critical Error Warning Info

7 codes

0x00000020Warning

ERROR_SHARING_VIOLATION

The process cannot access the file because it is being used by another process.

System errors32

0x00000050Warning

ERROR_FILE_EXISTS

The file already exists.

System errors80

0x000000B7Warning

ERROR_ALREADY_EXISTS

Cannot create a file when that file already exists.

System errors183

0x000000E7Warning

ERROR_PIPE_BUSY

All pipe instances are busy.

System errors231

0x000000F0Warning

ERROR_SESSION_CREDENTIAL_CONFLICT

Multiple connections to a server using more than one username are not allowed.

System errors240

0x000003E3Warning

ERROR_OPERATION_ABORTED

The I/O operation has been aborted because of either a thread exit or an application request.

System errors995

0x000004D5Warning

ERROR_RETRY

The operation could not be completed. A retry should be performed.

System errors1237