In this guide, we will help you troubleshoot the causes of the error and resolve the issue. Let’s start!

What causes the Azure functions runtime is unreachable error?

There could be various reasons why functions app runtime error occurs; some of the popular ones are: 

Lost access to storage account – If the function app has lost access to the storage account, you might get this error.  Storage account deleted– If you have mistakenly deleted the storage account, then you can encounter this error. You need to create a new storage account. Storage account settings – If you have input the wrong credentials or deleted some of the settings, then you might get this error message. Check the storage account credentials and application settings to know the issue. Daily execution quota – If you have exhausted the daily execution quota assigned, then the function app will be disabled temporarily. Increase the quota to fix the issue. Network connectivity issues– If the function app has IP restrictions blocking internet access or inbound traffic, you might get this error.

How can I fix the Azure functions runtime is unreachable error?

1. Check if the storage account has been deleted 

All function apps need a storage account to work, and if the account is deleted, functions won’t operate. To fix this, check these elements: 

2. Check if storage account application settings are deleted

If the connection string was overwritten or deleted, you might not find it. This could have happened because you use Azure Resource Manager scripts or deployment slots to set application settings. These are the actions you need to take: SPONSORED

3. Check if the storage account is accessible 

The Azure function application must have access to the storage account to operate. Here are some things you need to do to resolve the issue: 

4. Daily execution quota exhausted

5. Check the firewall settings for the function app

A firewall could restrict the function app; check these areas to be certain: 

6. Container errors on Linux

If there is a problem with the container, then the function apps running on Linux in a container can show the error. To fix this, follow these steps:  So, these are some things you need to check to fix azure functions; runtime is an unreachable error. If you have any questions or concerns, please feel free to mention them in the comments below. We will be happy to help!

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