On August 12th, 2026, at approximately 02:56 UTC, we received our first customer report regarding an issue that affected the Application Configuration and IP Filter List features, resulting in these areas failing to load for a number of customers. Application publishing and runtime were not affected. Customers saw the error codes OS-APPC-60043 and OS-CFGC-GEN-60030. This prevented some users from completing required application configuration changes. Normal service was restored at 08:00 UTC.
It was caused by a recent update to an internal service that provides configuration data. The update unintentionally changed how requests were routed between instances of that service, so most requests for IP filter information reached an instance that could not answer them and timed out. Our team identified the faulty update and rolled it back across all environments to restore normal behavior.
We are improving our pre-release testing and monitoring so that this type of issue is caught before it reaches production, and adding monitoring coverage specifically for this failure mode.