RPC_S_COOKIE_AUTH_FAILED 0x80070729

Error code 1833 · HRESULT 0x80070729

WINDOWS

HTTP proxy server rejected the connection because the cookie authentication failed.

Windows troubleshooting diagram: Device Manager warning and a system file scan
Windows errors: check drivers, system files and Event Viewer, in that order.

What it means

RPC_S_COOKIE_AUTH_FAILED is a Windows error code (system error 1833, returned as HRESULT 0x80070729) reported by Windows. Its official message is: “HTTP proxy server rejected the connection because the cookie authentication failed.”

How to fix RPC_S_COOKIE_AUTH_FAILED

  1. Run the affected program as administrator (right-click → Run as administrator)
  2. Check permissions on the target resource: Properties → Security → your account
  3. Check Event Viewer → Windows Logs → Security for the matching audit entry

Related errors

RPC_X_WRONG_PIPE_VERSIONRPC_S_DO_NOT_DISTURBRPC_X_WRONG_PIPE_ORDERERROR_INVALID_PARAMETERERROR_DISK_FULLERROR_SEM_TIMEOUTERROR_INVALID_NAMEERROR_MOD_NOT_FOUND

Source: Microsoft WinError.h

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