BerriAI/litellm · error · AuthenticationError

Azure AD authentication failed for Redis

Error message

Azure AD authentication failed for Redis

What it means

Error "Azure AD authentication failed for Redis" thrown in BerriAI/litellm.

Source

Thrown at litellm/_redis.py:314

        # Only include username when explicitly set — sending AUTH "" <token>
        # is invalid for most ACL-configured Azure Redis instances.
        username: Final = os.environ.get("REDIS_USERNAME", "")
        if username:
            auth_args = (username, access_token)
        else:
            auth_args = (access_token,)

        self.send_command("AUTH", *auth_args, check_health=False)

        try:
            auth_response = self.read_response()
        except AuthenticationWrongNumberOfArgsError:
            # Fallback: try with just the token (Redis < 6 / no ACL)
            self.send_command("AUTH", access_token, check_health=False)
            auth_response = self.read_response()

        if str_if_bytes(auth_response) != "OK":
            raise AuthenticationError("Azure AD authentication failed for Redis")

    # Attach the live credential object so async paths can wrap it in
    # AzureADCredentialProvider for refresh-aware token retrieval. The raw
    # client_id/tenant_id/secret are intentionally NOT exposed here — the
    # credential closure already holds them.
    ad_connect._azure_credential = credential
    return ad_connect


def get_redis_url_from_environment():
    if "REDIS_URL" in os.environ:
        return os.environ["REDIS_URL"]

    if "REDIS_HOST" not in os.environ or "REDIS_PORT" not in os.environ:
        raise ValueError("Either 'REDIS_URL' or both 'REDIS_HOST' and 'REDIS_PORT' must be specified for Redis.")

    if "REDIS_SSL" in os.environ and os.environ["REDIS_SSL"].lower() == "true":
        redis_protocol = "rediss"

View on GitHub (pinned to 6c2dcb801b)

Solutions

1. Check Azure AD credentials for Redis (managed identity or service principal) and ensure the identity has access to the Redis cache.

When it happens

Trigger: Thrown at litellm/_redis.py:314 when the library encounters an invalid state.

Common situations: See trigger scenarios.

Understand the failure class

• Authentication and authorization failures — expired tokens, bad credentials, and missing scopes.

AI-assisted analysis of BerriAI/litellm@6c2dcb801b (2026-08-15). Data as JSON: /api/errors/e0f351d41754c3c8. Report an issue: GitHub.