Azure Front Door
An Azure service that provides a cloud content delivery network with threat protection.
576 questions
How can I resolve the "Unavailable Backends" issue occurring in Azure Front Door Resource Health?
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(54.400000000000006, 59%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJH%3C/text%3E%3C/svg%3E)
Jeon Hyoungho
0
Reputation points
Service Type : Front Door Standard and Premium
Summary : Everything seems to be working fine, but in Resource Health, it appears as follows. Unavailable (Unplanned) One or more of your Front Door/CDN profiles backends are responding with errors to health probes. The backends associated with this Front Door/CDN profile are not responding to health probes with the expected status.
I've checked the metrics but haven't found any issues.
I currently believe the situation is due to Azure's problem. How can I resolve this?
{count} votes
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KapilAnanth-MSFT 35,001 Reputation points Microsoft Employee2024-03-18T04:27:19.26+00:00 Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
- Is the issue still happening?
- Where exactly are you seeing this error message? Please share a screenshot of the entire window
- Is the AFD working and you are getting this nevertheless?
- Or is the AFD not working and giving an error code such as 502?
- Can you confirm if the "Health Probes" for this Origins are enabled?
Cheers,
Kapil
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(108.80000000000001, 55.00000000000001%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELM%3C/text%3E%3C/svg%3E)
Liam Murphy 0 Reputation points2024-03-20T00:11:16.0633333+00:00 We are seeing precisely the same scenario as described above. To make matters worse, this then seems to trigger Front Door to block access to the web site it is meant to be protecting. To the best of my knowledge, the backend is absolutely fine and can be accessed directly without issue. I've even tried disabling the health probe but it keeps getting re-enabled and others have reported that as a problem too in the last couple of days. Is Front Door fundamentally broken?
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KapilAnanth-MSFT 35,001 Reputation points Microsoft Employee
2024-03-20T12:26:22.98+00:00 Can you please share the results of the follow up queries?
- Where exactly are you seeing this error message? Please share a screenshot of the entire window
- Is the AFD working and you are getting this nevertheless?
- Or is the AFD not working and giving an error code such as 502?
- Can you confirm if the "Health Probes" for this Origins are enabled?
- Can you please share the "Origin Health Percentage" for past hour from the AFD Metrics.
Cheers,
Kapil
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