Azure-functions-host: "The function runtime is unable to start"

[sergsalo]

We frequently receive this error for our function:

The function runtime is unable to start.

Session Id: fd5ade68ca494eb7af2b281c468c5b15
Timestamp: 2018-01-23T00:48:44.670Z

We have 12 triggers and our app is on consumption plan. I wonder what the issue might be - too many functions? It works sporadically... app sometimes just terminates.

[mathewc]

Can you please share details as per https://github.com/Azure/azure-webjobs-sdk-script/wiki/Sharing-Your-Function-App-name-privately so we can investigate?

[sergsalo]

the name of the function is ampmonitoring-dev-westus

[sergsalo]

I believe there is some issue with my subscription... it worked in different subscription. I'll close this one.

[Anufryieu]

Hi! I have got the same error 2 times.
It happens when my function app tries to use queue from another azure region.

[joeyeng]

We're getting this today for one of our function apps. Unfortunately there doesn't appear to be anything in the logs, so I'm unable to do the share your private function tip. I tried restarting, but didn't help. Are there benefits to using app service plan vs consumption plan to protect us from these outages?

[paulbatum]

It should not be possible for you to get this error without there being additional details in the log. Have you got app insights enabled? If not please enable it and then look at the contents of the traces table.

If you are still unable to diagnose please file a new issue with the information in our issue template so we can look at our logs and investigate.

[joeyeng]

@paulbatum Yes, AI is enabled and I looked at the traces table, but there's nothing with a severity level > 1 in the past 7 days. We opened a ticket (118040517948607) with support today. Thanks.

[joeyeng]

@paulbatum It was failing because there was an IP restriction set. We had a single entry pointing to our APIM instance IP. Once I removed the IP restriction the error went away. Are there some additional Azure IP(s) that need to be included in the whitelist? To clarify, these are the Networking > IP Restriction settings in the Function App.

[joeyeng]

@paulbatum Sorry, I'll move this to a new issue.

[joeyeng]

Here's the issue for anyone else that runs into this: #2643