Azure Static Web Apps
An Azure service that provides streamlined full-stack web app development.
1,131 questions
Static Web App randomly goes offline with 503 errors
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Adrian Campos
20
Reputation points
I have a production static web app with managed functions that randomly goes down and returns 503s. Here are the trouble shooting steps I've taken:
- Diagnose and solve problems blade - This shows absolutely no issues. It shows nothing but 200 level requests and seems to not report any of the 500s even after hitting the app 15 times and getting 503's 15 times.
- Monitoring tab - shows zero 500 responses
- Service Health - No service health issues reported for static web apps
Since there is no way to "restart/reboot" the underlying infrastructure, the only way I can get it to start serving pages correctly again is to force a redeploy from my azure devops pipelines. After that, everything starts working again.
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Laxman Reddy Revuri 3,990 Reputation points Microsoft External Staff2025-04-11T16:44:16.5166667+00:00 Hi @Adrian Campos
The 503 errors you're seeing are likely due to a transient issue with the managed functions backend in your Static Web App.
Ensure that all necessary environment variables are correctly configured as Application Settings.
Kindly enable Application Insights to help monitor API requests, failures, and tracing information. Application Insights logs the full error message and stack trace generated by each error.
Consider implementing auto-healing for your app. This feature allows the worker process to be recycled automatically based on defined conditions, which can help recover from 503 errors without requiring redeployment.
Troubleshooting deployment and runtime errors in Static Web Apps -
Laxman Reddy Revuri 3,990 Reputation points Microsoft External Staff
2025-04-14T18:54:01.47+00:00 Hi @Adrian Campos
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help. -
Adrian Campos 20 Reputation points
2025-04-15T03:33:36.5+00:00 Sorry I got caught up. It appears my log workspace was deleted and app insights was not logging anything from my static web app. I've gone and fixed that, hopefully it helps me find the issue.
Regarding environment variables, nothing has changed, there have been no deployments so it can't be that.
Regarding the auto-heal, that sounds like an awesome feature, but it doesn't seem to be supported by static web apps.
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Laxman Reddy Revuri 3,990 Reputation points Microsoft External Staff
2025-04-16T17:24:40.21+00:00 Hi @Adrian Campos
I am glad to hear you’ve reconnected Application Insights. That should help surface more detailed telemetry next time the issue occurs.Auto-heal is a feature available in App Service and Azure Function Apps (hosted independently), but it's currently not supported for Static Web Apps with managed functions. Unfortunately, that limits recovery options a bit, which is why redeploying helps as a workaround.
Since your environment variables and deployments haven’t changed, and now that App Insights is enabled, the next step would be to monitor any patterns particularly around
- Cold starts or delayed function initializations
- Errors in bindings or timeouts from upstream services
- Any anomalies in the execution logs (which weren’t previously visible)
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Laxman Reddy Revuri 3,990 Reputation points Microsoft External Staff
2025-04-17T23:23:55.57+00:00 Hi @adrian campos
We haven’t heard from you on the last response and was just checking back to see if you have a resolution yet. In case if you have any resolution please do share that same with the community as it can be helpful to others. Otherwise, will respond with more details and we will try to help.
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