Azure Function App - Error: Encountered an error (ServiceUnavailable) from host runtime

Question

Azure Function App - Error: Encountered an error (ServiceUnavailable) from host runtime

Syed Muhammad Hani 10

I am trying to deploy an Azure Function in python to a Function App, but I keep getting this error message in logs. Service Health shows no issue, I've double checked all connection strings, and checked the available solutions which suggest removing WEBSITE_RUN_FROM_PACKAGE from settings. This same function app was previously working fine, started having this issue two days ago.

Logs for the error as as follows:

Syncing triggers...
9:42:56 AM extract-attachment1: Syncing triggers (Attempt 2/6)...
9:43:07 AM extract-attachment1: Syncing triggers (Attempt 3/6)...
9:43:29 AM extract-attachment1: Syncing triggers (Attempt 4/6)...
9:44:11 AM extract-attachment1: Syncing triggers (Attempt 5/6)...
9:45:32 AM extract-attachment1: Syncing triggers (Attempt 6/6)...
9:45:34 AM: Error: Encountered an error (ServiceUnavailable) from host runtime.

Devendra Kumar K S (LTIMINDTREE LIMITED) 0 Reputation points Microsoft External Staff

2024-12-23T20:07:53.1866667+00:00

Hi, I have the same question and looking for a help. Any help is appreciated.

Thanks,

Dev
Syed Muhammad Hani 10 Reputation points

2024-12-24T09:33:29.7733333+00:00

The issue is resolved. It was caused by a library in requirements file, which had an OS level dependency. In my case it was psycopg2. I had to define the binary file name for psycopg2 instead of it's version name in the requirements file, and the issue was resolved.

4 answers

Your answer

Devendra Kumar K S (LTIMINDTREE LIMITED) 0 Reputation points Microsoft External Staff

2024-12-23T20:07:53.1866667+00:00

Hi, I have the same question and looking for a help. Any help is appreciated.

Thanks,

Dev
Syed Muhammad Hani 10 Reputation points

2024-12-24T09:33:29.7733333+00:00

The issue is resolved. It was caused by a library in requirements file, which had an OS level dependency. In my case it was psycopg2. I had to define the binary file name for psycopg2 instead of it's version name in the requirements file, and the issue was resolved.

Answer 1

Narcis Dumitrescu 0

In my case it was a bad secret config missing in key vault

Amazing the self diagnose really helped

User's image

Then at the bottom I saw:

[ResolveWorkitem] SecretNotFound error while retrieving Key Vault Secret Reference @Microsoft.KeyVault(VaultName=XXXX;SecretName=xxxxx-access-key). Exception: KeyVaultResolver.Common.ReferenceResolverException: Exception of type 'KeyVaultResolver.Common.ReferenceResolverException ...

0 comments

Answer 2

Rakesh Karia 5

Usually I have seen bug in azure function app and logic app. I have re-created function app and problem was resolved. Microsoft will never accept that there is an issue with their host

0 comments

Answer 3

Jose Gonzalez 0

In my case, I had set a timeout in the host.json file that was too large compared with the consumption plan.
Reducing the timeout value to an acceptable value solved the problem

0 comments

Answer 4

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