Starting at approximately 16:00 UTC, we began experiencing DNS issues resulting in availability degradation of some services. Customers may experience issues accessing the Azure Portal. We have taken action that is expected to address the portal access issues here shortly. We are actively investigating the underlying issue and additional mitigation actions.

We have initiated the deployment of our 'last known good' configuration. This is expected to be fully deployed in about 30 minutes from which point customers will start to see initial signs of recovery. Once this is completed, the next stage is to start to recover nodes while we route traffic through these healthy nodes.

At this stage, we anticipate full mitigation within the next four hours as we continue to recover nodes. This means we expect recovery to happen by 23:20 UTC on 29 October 2025. We will provide another update on our progress within two hours, or sooner if warranted.

ALB will validate the token signature and requires two mandatory claims: 'iss' (issuer) and 'exp' (expiration). Additionally, if present in the token, ALB will also validate 'nbf' (not before) and 'iat' (issued at time) claims. You can configure up to 10 additional claims for validation.

These claims support three formats:
🔹 Single-string: A single text value
🔹 Space-separated values: Multiple values separated by spaces (maximum 10 values)
🔹 String-array: An array of text values (maximum 10 values)

If the token is valid, the load balancer forwards the request with token as is to the target. Otherwise, it rejects the request.