Storing session state in memory can result in losing session state when there's a problem with the application or App Service. Evaluate per-app scaling for high density hosting on Azure App Service.Įxplore the following table of recommendations to optimize your App Service configuration for service reliability: ASE RecommendationĬonsider disabling ARR Affinity for your App Service.ĪRR Affinity (Application Request Routing) sets an affinity cookie, which is used to redirect users to the same node that handled their previous requests.Review Azure App Service diagnostics to ensure common problems are addressed.Enable Application Insights Alerts to signal fault conditions.

Enable Diagnostic Logging to provide insight into application behavior.

Enable Local Cache to reduce dependencies on cluster file servers.

Enable Autoscale to ensure adequate resources are available to service requests.

Enable Health check to identify non-responsive workers.

Evaluate the use of TCP and SNAT ports to avoid outbound connection errors.

Use Basic or higher plans with two or more worker instances for high availability.

Use Run From Package to avoid deployment conflicts.

Use Deployment slots for resilient code deployments.

Consider configuring Upgrade preference if multiple environments are used.

Ensure the ASE Network is configured correctly.

Ensure App Service Environments (ASE) are deployed in highly available configurations across Availability Zones.

Understand IP Address deprecation impact.

Access the on-prem database using private connections like Azure VPN or Express Route.Enable Always On to ensure Web Jobs run reliably.Use a different store for session state.Consider disabling ARR Affinity for your App Service.

Azure web app deployment slot vnet