Hello. The user is in Nigeria. On his Android phone, he opens our sites without problems ( https://main-site-git-main-zetradex-team.vercel.app/ as an example), but on his MacBook, our sites do not open. The site simply does not respond. The problem is definitely not in the application itself, since I uploaded the same application to Netliffey and everything opens without problems. How can I solve this problem? I thought that the problem might be in the user’s MacBook, but the user also checked the availability of the site on his friend’s iPhone and the site also did not open.
The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for bonus points.
You can also use v0 to narrow down the possibilities.
There are known issues with some ISPs in Nigeria blocking some IP addresses. If your DNS provider allows CNAME flattening for your apex domain, then using cname.vercel-dns.com. for that may help.
This thread has more tips:
Please give those ideas a try and let me know if you still have trouble with this 
1 Like
Hello. Sorry for the long reply. Adding CNAME really solved the problem, but one of our resources started having accessibility bugs and we returned everything to A records. Now we are trying to gradually remove A records from all our sites and transfer them to CNAME. I will write here about the result, I hope that within a week we will be able to solve this problem
2 Likes
Hey @pavelzetradex. Did you get it working?
Hello. current configuration on dns provider:
@ A record 76.76.21.21
web A record 76.76.21.21 and several more A records for different resources
CNAME record is set for my and my.example.com resource works fine.
we tried to add one more record for @, in the end it turned out like this
@ A record 76.76.21.21
@ CNAME cname.vercel-dns.com
but after that the site became unavailable. we also tried to delete @ A record 76.76.21.21 and leave only
@ CNAME cname.vercel-dns.com the site was also unavailable. the problem could not be solved
we added
www CNAME cname.vercel-dns.com
and www.example.com in Nigeria works fine.
it turns out the problem is in @ A record 76.76.21.21 but we can’t change it to @ CNAME cname.vercel-dns.com because all our services immediately become unavailable.
1 Like
Thanks for confirming this. So, now your site is correctly working or still some issues?
No, the problem is still relevant.
we need to ensure accessibility for example.com in nigeria
I see. Can you share the domain name in question so I can check the DNS propagation?
here is zetradex.com
The root CNAME implementations vary by DNS provider, and not all support CNAME flattening, so that solution doesn’t work for some cases. Thanks for giving it a try.
A more stable solution is to use Vercel nameservers and copy your DNS records over to manage on your Vercel dashboard. That way the IP would be dynamic to better serve all regions. Would that work for you?
1 Like
This topic was automatically closed 90 days after the last reply. New replies are no longer allowed.