9,751 ERROR CODES DECODED · PRESS "/" TO SEARCH
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Error Decoder explains error codes in plain English. Paste a code from a dialog box, a log file or a browser page — 0x80070005, ERR_CONNECTION_RESET, 10054, HTTP 503, EACCES or P0420 — and you get what it means, why it usually happens and the steps to fix it, ordered from the quickest to the most thorough.
The index covers 9,751 codes taken from official sources: the Windows SDK headers, the Chromium source code, the Linux kernel, the IANA HTTP registry, SteamKit and open Xbox and OBD-II databases. The most searched codes have guides written and checked by our editors; see the editorial policy for how pages are researched and updated.
Browse error codes by platform
WindowsWindows error codesSystem error codes, HRESULT (0x8007…) and NTSTATUS (0xC000…) values.8,949 codes
BrowserChrome and Edge network error codesERR_* network errors from Chrome, Edge and other Chromium browsers.266 codes
HTTPHTTP status codes4xx and 5xx status codes for visitors and site owners.64 codes
LinuxLinux errno error codeserrno values such as EACCES, ENOENT and ECONNRESET.132 codes
XboxXbox error codesXbox start-up, system-controller and OS error codes.150 codes
SteamSteam error codes (EResult)Steam client and store EResult error numbers.130 codes
Car OBD-IIOBD-II car trouble codesOBD-II diagnostic trouble codes behind the check-engine light.60 codes
Most searched error codes
ERROR_ACCESS_DENIEDWINDOWS0x80070005Access is denied.
ERR_CONNECTION_RESETBROWSER-101The connection was reset.
HTTP 404 Not FoundHTTP404Not Found
WSAECONNRESETWINDOWS0x80072746Connection reset by peer.
ERR_NAME_NOT_RESOLVEDBROWSER-105The web address could not be resolved.
HTTP 503 Service UnavailableHTTP503Service Unavailable
STATUS_ACCESS_VIOLATIONWINDOWS0xC0000005The instruction referenced memory that could not be read or written.
ERR_CONNECTION_REFUSEDBROWSER-102The site can't be reached — connection refused.
HTTP 429 Too Many RequestsHTTP429Too Many Requests
ERROR_FILE_NOT_FOUNDWINDOWS0x80070002The system cannot find the file specified.
ERR_SSL_PROTOCOL_ERRORBROWSER-107A fatal SSL protocol error occurred.
HTTP 502 Bad GatewayHTTP502Bad Gateway
ERR_CONNECTION_TIMED_OUTBROWSER-118The connection has timed out.
ERROR_SHARING_VIOLATIONWINDOWS0x80070020The process cannot access the file because it is being used by another process.
HTTP 500 Internal Server ErrorHTTP500Internal Server Error
ERR_TOO_MANY_REDIRECTSBROWSER-310This page isn't working — redirected you too many times.
WSAEADDRINUSEWINDOWS0x80072740Only one usage of each socket address is normally permitted.
ERROR_MOD_NOT_FOUNDWINDOWS0x8007007EThe specified module could not be found.
ERR_CERT_AUTHORITY_INVALIDBROWSER-202The certificate is not signed by a trusted authority.
HTTP 403 ForbiddenHTTP403Forbidden
P0420AUTOCatalyst System Efficiency Below Threshold (Bank 1)
P0300AUTORandom/Multiple Cylinder Misfire Detected
EACCES (errno 13)LINUXerrno 13Permission denied
ENOENT (errno 2)LINUXerrno 2No such file or directory