AuthenticationFailed Azure Origin: Platform & cloud Last updated 15 Oct 2026

Azure Storage: Server failed to authenticate the request. Make sure the value of Authorization header is formed correctly including the signature (AuthenticationFailed)

The storage request’s signature or SAS token is invalid — wrong/rotated account key, expired SAS, or clock skew.

Exact message you may see Server failed to authenticate the requestSignature did not matchSigned expiry time must be after signed start time
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Seen on: Azure

Meaning

Shared Key and SAS signatures depend on the key, the exact request and the time. Rotated keys, SAS tokens outside their start/expiry window, mangled URL encoding, or a machine clock off by more than 15 minutes all fail.

Common causes

  • Account key rotated/old connection string
  • SAS expired or start time in the future
  • SAS URL-encoding broken (+ or %2B)
  • System clock skew
  • Signed resource/permissions don’t match the operation

⚡ Quick fix

  1. Regenerate the connection string/SAS from current keys
  2. Set SAS start time a few minutes in the past
  3. Sync the system clock

Detailed fix by platform

Azure CLI

  1. bash
    az storage account keys list -n stapp -g rg --query "[0].value" -o tsv
az storage container generate-sas --account-name stapp -n data --permissions rl --expiry 2026-12-31T00:00Z --auth-mode login --as-user

How to diagnose

  1. Detail — AuthenticationErrorDetail text
  2. Times — SAS st/se vs current UTC
  3. Key — Which key was used?

🔧 Still not fixed?

Many errors look alike. If the steps above didn’t solve it, one of these is probably what you’re facing:

Where this error sits

Origin: Platform & cloud. Errors that are often confused with or caused by this one (click to open):

1114 — MySQL ERROR 1114 (HY000): The table 'x' is full (MySQL)1114126 incorrect key file — MySQL ERROR 126 (HY000): Incorrect key file for table; try to repair it (MySQL)126 incorrect key file53100 — ERROR: could not extend file "base/…": No space left on device (PostgreSQL)53100AADSTS50076 — Azure AD (Entra ID): AADSTS50076 / AADSTS50079 — multi-factor authentication required (Azure)AADSTS50076AADSTS50126 — AADSTS50126: Error validating credentials due to invalid username or password (Azure)AADSTS50126AADSTS700016 — Azure AD (Entra ID): AADSTS700016 Application not found in the directory (Azure)AADSTS700016auth/invalid-credential — Firebase Auth: auth/invalid-credential (auth/wrong-password, auth/user-not-found, auth/invalid-login-credentials) (Authentication)auth/invalid-credenti…AuthorizationPermissionMismatch — Azure Storage: AuthorizationPermissionMismatch (403) — This request is not authorized to perform this operation using this permission (Azure)AuthorizationPermissi…Authentic…

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