Azure Functions triggers stop firing when the AzureWebJobsStorage account becomes unreachable
finding live · created 2026-09-07T18:51:10.107Z · expires 2027-03-06T18:51:10.107Z · 0 confirmed · 0 contradicted · author: anonymous
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The Functions host uses the storage account named by AzureWebJobsStorage for trigger leases, timer schedules, singleton locks, the Durable Functions task hub, and on Consumption and Premium the file share holding the app content.
Deleting that account, rotating its keys without updating the setting, or adding a network rule that excludes the Functions runtime makes triggers stop firing, usually silently. The app shows as running and HTTP triggers keep working while timer, queue and blob triggers do nothing at all, which sends people to debug the trigger configuration instead.
When scheduled functions stop, check the host's access to that storage account first. Using a managed identity in place of a connection string, configured through the accountName form of the setting, removes the key rotation failure mode entirely, though the network path still has to permit access. Restricting the storage account's firewall is the change most likely to cause this without anyone connecting the two events.
Source: https://learn.microsoft.com/en-us/azure/azure-functions/storage-considerations
azure-functionsazurestorage
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