InvalidAuthenticationInfo
Azure Storage InvalidAuthenticationInfo means the request reached Storage, but the authentication metadata is missing, malformed, inconsistent with the signed request, or unusable for the target endpoint.
Last reviewed: May 4, 2026|Source-backed guidance under our editorial policy
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What Does Invalid Authentication Info Mean?
Storage rejected the request before authorization because it could not authenticate the caller from the supplied metadata. The useful boundary is authentication material integrity: which auth scheme was intended, which headers and query parameters were actually sent, whether they match the canonical signed request, and what the WWW-Authenticate challenge says the service expected.
Common Causes
- -Authorization header is missing, malformed, duplicated, or uses the wrong scheme for the selected auth method.
- -Shared Key signature or SAS token was computed over different headers, path, query string, or timestamp than the request actually sent.
- -Bearer token audience, tenant, issuer, or resource scope does not match the Storage endpoint challenge.
- -Proxy, gateway, CDN, or custom middleware strips or rewrites signed headers after signing.
- -Client clock skew or stale credentials make date-bound authentication material invalid.
How to Fix Invalid Authentication Info
- 1Inspect the 401 response, especially
WWW-Authenticate,x-ms-request-id, date, and auth-related error details. - 2Confirm the request uses exactly one auth scheme: OAuth bearer, Shared Key, or SAS.
- 3Recompute the signature or token against the final outbound method, URL, headers, query string, and body length.
- 4Replay a minimal request with Azure CLI or an official SDK to separate credential problems from custom signer bugs.
- 5Bypass or instrument intermediaries to prove signed headers are not modified after signing.
Step-by-Step Diagnosis for Invalid Authentication Info
- 1Capture the redacted request/response pair including method, URL path, query, signed headers, date headers, and
WWW-Authenticatechallenge. - 2Verify authentication mode matches endpoint, account configuration, SDK credential chain, and any account-level Shared Key restrictions.
- 3Recompute Shared Key or SAS signature against the exact canonical request that left the client process.
- 4Decode bearer token claims and compare audience, issuer, tenant, expiry, and scopes to the Storage challenge.
- 5Replay with a known-good minimal request from Azure CLI or official SDK to isolate client implementation drift.
Seen in Production
- -A reverse proxy removes
x-ms-dateafter a custom Shared Key signer includes it in the canonical string. - -A service migrates from Shared Key to OAuth but a legacy Authorization header is still attached.
- -A SAS token is generated for one blob path while the client requests a URL-encoded variant of another path.
- -A container image has enough clock skew for date-bound Storage authentication to fail intermittently.
Authorization Header Integrity Checks
- -Validate the final outbound Authorization header after all middleware layers, not just the header produced by the signer.
- -Confirm the auth scheme matches the credential type and that mixed auth metadata is not being sent.
Challenge and Signing Context Analysis
- -Parse
WWW-Authenticatechallenge details and align tenant, audience, and resource selection. - -Audit canonicalized signed elements for Shared Key or SAS requests, including header ordering, URL encoding, and content length.
Decision Shortcut: Authentication vs Authorization
- -If Storage cannot parse or validate auth metadata, fix InvalidAuthenticationInfo before checking RBAC.
- -If the caller authenticates but lacks permission, inspect AuthorizationPermissionMismatch or AuthorizationFailed instead.
- -If SAS is present, compare signed resource, permissions, expiry, and path before regenerating account keys.
Wrong Fix to Avoid
- -Do not rotate account keys before proving the signature was computed correctly.
- -Do not add RBAC roles to fix a request that has not authenticated yet.
- -Do not log raw Authorization headers or SAS tokens while debugging canonical-request mismatches.
Implementation Examples
2026-05-02T08:32:11Z service=blob account=prodstorage request=PutBlob
auth=SharedKey signedHeaders="x-ms-date;x-ms-version;x-ms-blob-type"
egressHeaders="x-ms-version;x-ms-blob-type" status=401 error=InvalidAuthenticationInfo requestId=3f6c1a44-1111-4444-9999-f58d7b000000az storage blob upload \
--account-name prodstorage \
--container-name app-artifacts \
--name releases/app.zip \
--file ./app.zip \
--auth-mode login \
--debug 2> azure-storage-debug.log
grep -n "WWW-Authenticate\|x-ms-request-id\|InvalidAuthenticationInfo" azure-storage-debug.logconst request = buildStorageRequest({
method: 'PUT',
url: finalUrlAfterEncoding,
headers: finalHeadersAfterMiddleware,
bodyLength: fileSize,
});
request.headers.Authorization = signSharedKey(request);
await fetch(request.url, request);Incident Timeline
08:31 UTC
Client signs a Storage request
Signal: Custom client, SDK, or gateway generates bearer, Shared Key, or SAS authentication metadata.
Why it matters: The signed material must match the final request byte-for-byte in the fields included by the scheme.
08:32 UTC
Storage returns InvalidAuthenticationInfo
Signal: The service responds with 401 before evaluating object-level authorization.
Why it matters: The fix is auth metadata integrity, not broader permissions.
08:38 UTC
Canonical request drift is identified
Signal: Redacted capture shows changed path encoding, missing signed header, wrong audience, or stale timestamp.
Why it matters: Regenerate credentials only after the final outbound request is understood.
08:49 UTC
Official SDK replay succeeds
Signal: The same operation works through Azure CLI or SDK with the intended auth mode.
Why it matters: The remaining issue is custom signing, middleware, or deployment configuration.
Seen in Production
Custom HTTP client signs request but reverse proxy rewrites headers
Frequency: common
Example: Storage returns 401 InvalidAuthenticationInfo because transmitted header no longer matches signed value set.
Fix: Disable auth-header mutation in proxy path and sign the exact final request payload.
Service migrates from Shared Key to OAuth but keeps legacy header builder
Frequency: rare
Example: Request sends mixed auth metadata and Storage cannot validate caller identity.
Fix: Remove legacy signing path and enforce one auth scheme per endpoint.
Wrong Fix vs Better Fix
Key rotation vs canonical diff
Wrong fix: Rotate Storage account keys immediately.
Better fix: Diff the canonical string or token claims against the final outbound request first.
Why this is better: Most InvalidAuthenticationInfo incidents are request construction issues, not compromised keys.
RBAC change vs auth challenge handling
Wrong fix: Add Storage Blob Data Contributor to the principal.
Better fix: Follow the WWW-Authenticate challenge and send a valid token for the correct audience and tenant.
Why this is better: RBAC is evaluated after successful authentication.
Proxy guesswork vs header capture
Wrong fix: Assume the proxy path preserves signed headers.
Better fix: Capture redacted egress headers at the last hop before Storage.
Why this is better: Signed-header mutation is invisible if you only inspect the client-side signer.
Debugging Tools
- -Storage request/response capture
- -WWW-Authenticate header inspection
- -Azure CLI with --debug
- -Signer canonical-request diff tooling
How to Verify the Fix
- -Replay the same Storage operation and confirm
InvalidAuthenticationInfono longer returns. - -Validate successful auth across all environments and deployment slots using the same auth mode.
- -Check monitoring for elimination of repeated 401 signatures on the affected endpoint.
- -Confirm the redacted canonical request or token-claim debug output matches the final outbound request.
How to Prevent Recurrence
- -Standardize one authentication library/path per service to avoid ad hoc header construction.
- -Add preflight validation that inspects final outbound Authorization metadata in integration tests.
- -Keep proxy and gateway rules from mutating signed Storage headers or query strings.
- -Monitor Storage 401 patterns and alert when
WWW-Authenticatechallenges spike unexpectedly.
Pro Tip
- -store redacted canonical request components for signed calls so signature mismatches can be reproduced without exposing secrets.
Official References
Provider Context
This guidance is specific to Azure services. Always validate implementation details against official provider documentation before deploying to production.