Origin Timeout Events

EdwardStuart-0385 1

Hi there,

We've recently started to utilise Azure FD for all of our web apps, which has mostly been working fine. However, we keep getting the following OriginTimeout errors in the Health Probes logs.

We have two backend web servers set up, one primary, one failover. IP addresses for backend webservers and associated hostnames are open to the Azure IP ranges.

I want to make sure this solution is working 100% before fully committing, but these errors keep cropping up many times a day.

I want to know two things:

Is this normal behaviour?
Will this mark the origin as unhealthy?

We have checked that the firewall is not blocking anything, ran constant pings and latency checks with zero packet loss etc. - all appears ok!

Thanks!

KapilAnanth-MSFT 48,486 Reputation points Microsoft Employee

2022-10-18T13:30:58.777+00:00

Hi @EdwardStuart-0385 ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.
I understand that you are receiving timeout errors from Origin health probes.

Generally, the origin probes timing out are considered as probe failure.
This will mark the backend unhealthy.

You can consider configuring the origin time-out to a value that supports your backend's response time.
This is supported with Standard/Premium AFD.

Please let me know if this helps.

Cheers,
Kapil
EdwardStuart-0385 1 Reputation point

2022-10-18T13:35:32.073+00:00

Thanks Kapil.

We have set the origin timeout to the max 240 seconds.

I have been constantly checking the origin response times and uptime, seeing zero loss of packets.

I don't expect to see any timeouts, unless the backend server is rebooting etc.

I'm starting to lose a bit of faith in the product's reliability and will have to consider a different vendor if this continues. I just hope it's a bug or something?
KapilAnanth-MSFT 48,486 Reputation points Microsoft Employee

2022-10-19T04:09:16.717+00:00

Hi @EdwardStuart-0385 ,

Thanks for the update.

Ideally, this should not be the case.

This issue seems it would require a deeper investigation, so if you have a support plan, I request you file a support ticket, else please do let us know, we will try and help you get a one-time free technical support

Cheers,
Kapil

Share via

Origin Timeout Events

Your answer