Custom domain times out while vercel.app domain works

[rolfringer123-4090]

Hi,

I’m experiencing an issue with my custom domain.

Project domains:

• https://www.dmitrypod.tech

• https://portfolio-dimasik.vercel.app

Observed behavior:

• portfolio-dimasik.vercel.app works correctly from the same network.

• www.dmitrypod.tech works through VPN.

• www.dmitrypod.tech does not work without VPN and eventually returns ERR_CONNECTION_TIMED_OUT.

• The issue reproduces on both home internet and mobile network.

Diagnostics performed:

• Domain status in Vercel: Valid Configuration.

• DNS records configured exactly as requested by Vercel.

• DNS resolution works correctly via Google DNS (8.8.8.8) and Cloudflare DNS (1.1.1.1).

• nslookup returns 216.198.79.1.

• curl -I https://www.dmitrypod.tech returns HTTP/1.1 200 OK from Vercel.

• Browser requests eventually time out.

• portfolio-dimasik.vercel.app remains accessible from the same devices and networks.

Additional information:

• Region: Russia.

• Reproduced on desktop and mobile networks.

• Reproduced in Chrome, Edge and Incognito mode.

Could you please check whether there are any issues with routing, edge configuration, SSL, or traffic handling for this custom domain?

[amyegan]

Please try these troubleshooting guides and let me know how it goes. They can solve most domain issues

Troubleshooting domains

Resolving IP Blocking Issues

Overview If you have problems where your IP addresses are suddenly blocked, you may see: Inability to access certain Vercel hosted sites Debugging tools indicating blocked IP addresses Users on both personal and shared networks experiencing similar issues Typically, this is not a block from us, but an internet service provider (ISP) or network policy issue. This guide will help you understand and resolve these issues. Common Scenarios High Traffic Times: Some ISPs may block…

[rolfringer123-4090]

Thank you.

I have already completed most of the troubleshooting steps from the guide:

• Tested on multiple browsers (Chrome, Edge, Incognito)

• Tested with extensions disabled

• Tested on home internet and mobile internet

• Tested from another user in a different Russian region

• Tested using Google DNS and Cloudflare DNS

• Verified DNS configuration

• Verified Vercel domain configuration (Valid Configuration)

• VPN immediately resolves the issue

The problem reproduces consistently across different networks and users.

You mentioned the debug script and vercel-debug.txt output.

Could you please provide the exact debug script or instructions so I can generate and share the requested diagnostic information?

Thank you.

[rolfringer123-4090]

Additional information:

I contacted the domain registrar (Beget) and they confirmed that the domain is fully active.

The only WHOIS status is:

clientTransferProhibited

There are no clientHold or serverHold statuses on the domain.

We also performed additional testing:

• The issue reproduces for multiple users

• Different Russian regions

• Different ISPs

• Different mobile carriers

• Different devices and browsers

At the same time:

• portfolio-dimasik.vercel.app works correctly

• www.dmitrypod.tech times out without VPN

• VPN immediately resolves the issue

curl -v resolves the custom domain to:

• 216.198.79.65

• 64.29.17.65

Could you please verify whether there are any routing, edge network, or reachability issues associated with these IPs or with this specific custom domain configuration?

The evidence suggests this is not a local ISP issue and not a registrar/domain status issue.