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I have two custom domains, one set a default domain, hosted on Namecheap (premium DNS name servers).
My website experiences frequent downtime period of about 30 minutes (one day it lasted several hours), even multiple times per day.
These are my DNS records for both the primary/default and secondary domain:
And here you can see all incidents in the last week:
Any idea what's wrong?
Can you please sure more about the errors you're seeing? Are ping tests from all regions failing at the same times or only 1 region at a time? And can you share more details about the tests? Are you getting the problems from the www or apex domain?
Is it possible to set up a similar test that is pointed to the auto-generated "ambitious-field-..." domain to help narrow down the issue?
Are ping tests from all regions failing at the same times or only 1 region at a time?
The graph I posted is from betteruptime.com. The monitors are for "app becomes unavailable", they're not just ping requests. The response is:
HTTP/1.1 503 Service Unavailable
Server: squid/4.11
Mime-Version: 1.0
Date: Sat, 19 Feb 2022 15:01:22 GMT
Content-Type: text/html;charset=utf-8
Content-Length: 3593
X-Squid-Error: ERR_DNS_FAIL 0
Vary: Accept-Language
Content-Language: en
I also set a DNS monitor for the generated URL after I opened this thread. In this moment, there's an open incident. The generated URL resolves fine. My custom domains (.com and .org) don't resolve in any region.
I also noticed that while the generated URL resolves to different IPs depending on the region, my custom domains always resolve to the same IP in all regions. (I'm using dnschecker.org).
Should I maybe enable "Dynamic DNS" in Namecheap?
Thank you.
Are you monitoring your www or apex domain, or both? Do they both go down at the same time? This part is important to know because they resolve differently.
The fact that you’re seeing the custom domain resolve to a single IP sounds like it’s the apex domain that uses an alias record, but would be great to confirm. And would be great to know if the www domain experiences the same thing.
I'm monitoring only apex domains on betteruptime, because www urls are redirected to apex domains anyway. In this moment:
The fact that you’re seeing the custom domain resolve to a single IP sounds like it’s the apex domain that uses an alias record
Of course, isn't this implied by my first screenshot? (ALIAS record for @). I just followed the video guide in the official documentation step by step.
Thank you.
Sounds like this is a problem with the alias record and you should troubleshoot with Namecheap. The details you provided indicate that the CNAME records are resolving correctly. Alias is something Namecheap implements, where they look up the auto-generated hostname and return its IP as an A record.
I've contacted namecheap assistance but they weren't of any help and passed to buck to the web hosting service. I think I now have all the elements to put the blame on the namecheap. I'll contact them again.
Do you think that just removing the ALIAS record and forwarding the apex domain to the www domain as explained in the docs would solve the problem?
Also, in this case, should I set the www domain as default domain in Azure or that's completely independent because it happens at the HTTP level?
Thank you very much.
I'm not entirely sure but if the redirection is offered by namecheap, it should be done entirely by them and no traffic will reach the static web app using the apex domain.
I confirm this is a problem with the ALIAS implementation of NameCheap. As soon as I moved to CloudFlare (using CNAME flattening for the apex domain), the problems disappeared. I also kept my .org domain with NameCheap while my .com domain was with CloudFlare. I experienced an incident with the .org domain, while the .com domain resolved correctly.
I'm now using CloudFlare name servers for both my .org and .com domain and I've not experienced any DNS issue for 5 days.
I want to thank @Anthony Chu - MSFT for the help.
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GianlucaGippetto-3947, Thanks for the follow-up and sharing your observations and the solution. It's much appreciated.
Yes, thanks a bunch to @Anthony Chu - MSFT (our Azure Static Web Apps PG) for great insights and help.