Product or Service: Umbraco Cloud
Version: All versions
Issue: The customer has enabled IIS logging from the Umbraco Cloud portal configuration settings, but the log viewer still displays an informational banner stating: "IIS logging is not enabled. IIS logging is currently not enabled for this environment. You need to enable IIS logging from the IIS Logs settings page to see logs here."
Solution: IIS logging behavior on Umbraco Cloud is designed as a temporary diagnostic tool rather than a persistent logging solution. When experiencing this behavior, consider the following constraints:
12-Hour Session Limit: For performance optimization, IIS logging will only stay active for a maximum of 12 hours. Once this duration lapses, Umbraco Cloud automatically disables it, and the action triggers an environment/site reboot. Long-term activation is restricted to prevent substantial performance degradation.
Rolling File Size Limit: The IIS log files have a strict rolling size limit of 100 MB. When this threshold is met, the oldest log entries are progressively overwritten by new data.
Plan Availability: IIS logging is only supported for environments running on a Professional or Dedicated plan.
If logs are required beyond the 12-hour window or after a system auto-disable, you must navigate back to Configuration > Advanced (or your platform's configuration settings) in the Umbraco Cloud Portal to re-enable it manually.
Documentation reference: https://docs.umbraco.com/umbraco-cloud/optimize-and-maintain-your-site/monitor-and-troubleshoot/resolve-issues-quickly-and-efficiently/log-files
[!NOTE] Enabling or disabling IIS logging always initiates an automatic site reboot. Ensure this action is performed during lower-traffic windows if applied to a live environment.
Article last update date: 17-06-2026