Multiple users unable to resolve Railway-generated domain (ERR_NAME_NOT_RESOLVED)

Hello Railway Team,

We have a production backend hosted on Railway with the public domain:

https://voice-ai-backend-production-1714.up.railway.app

We are experiencing an issue where some users are unable to reach the backend, while others can access it normally.

Observations

The backend is healthy and accessible from our network.

/health returns a successful response.

The frontend is hosted on Vercel.

Affected users can open the frontend, but login fails because the backend request never reaches Railway.

We do not see any requests from affected users in the Railway logs.

Browser Error

Affected users receive:

net::ERR_NAME_NOT_RESOLVED

when requesting:

https://voice-ai-backend-production-1714.up.railway.app/api/auth/login

DNS Tests

Using the user's default DNS:

nslookup voice-ai-backend-production-1714.up.railway.app

fails or returns Query refused.

Using Cloudflare DNS:

nslookup voice-ai-backend-production-1714.up.railway.app 1.1.1.1

successfully resolves the hostname.

Additional Information

Using a VPN immediately resolves the issue.

Multiple users on different devices and networks have experienced the problem.

The request never reaches our backend, so nothing appears in Railway logs.

Could you please investigate whether there are any DNS, networking, CDN, or routing issues affecting the generated *.up.railway.app domain, particularly for users in India?

Thank you.