Hey, I can reach both services from my computer. Please give your devices some time to update their DNS records.

I have been trying since morning . I'm unable to login using my credential to the app ,neither I'm able to register new users. Why did it happen at first place? how long do I need to wait

My backend container is fully healthy (confirmed via console: curl localhost:8000/health returns 200 OK) but the public domain backend-production-56af.up.railway.app returns ERR_NAME_NOT_RESOLVED

I can also access both of your domains, please try on mobile data and or flushing your computer DNS.

Use cloudflare one client to access your application when you are in url: xxx.up.railway.app. If you don't want to use vpn then use custom domain

I wasn't using vpn. I was directly accessing it for last 15 days and all of a sudden i faced issues. I'll try cloudflare but I'm still clueless what went wrong

Pretty sure this is a DNS thing on your side, not Railway. ERR_NAME_NOT_RESOLVED means your device can't even look up the domain, so it's never actually reaching the server. Makes sense given the container's healthy and the mods can load it fine.

Quick things to try:

Switch to mobile data and see if it loads. If it does, it's your network's DNS.

Flush your DNS cache. ipconfig /flushdns on Windows, sudo killall -HUP mDNSResponder on Mac.

Change your DNS to 1.1.1.1 or 8.8.8.8 and restart your router. Your ISP's resolver is probably the culprit.

Run nslookup your-domain 1.1.1.1. If it resolves there but not normally, that confirms it's your ISP.

If you're putting this in front of real users, honestly just grab a custom domain and point a CNAME at it. The default railway subdomains can be flaky with some ISPs.

1. Test on mobile data first

Turn off WiFi on your phone and try loading the URL on mobile data. If it works, your home network/ISP's DNS is the culprit.

1. Flush your DNS cache (Mac)

bashsudo killall -HUP mDNSResponder

Then try again in a fresh browser tab.

1. Switch to a public DNS resolver

Change your DNS to Cloudflare or Google instead of your ISP's:

Cloudflare: 1.1.1.1 and 1.0.0.1

Google: 8.8.8.8 and 8.8.4.4

On Mac: System Settings → Network → your connection → DNS → add those IPs. Then restart your router.

1. Confirm it's DNS with nslookup

bashnslookup backend-production-56af.up.railway.app 1.1.1.1

If this resolves but your normal browsing doesn't, that proves your ISP's DNS is the problem.

I switched to mobile data and the problem still exists. I want to access the UI from 4-5 devices (friends) i.e mac,window,android and iphone to get initial feedback. The solution you're proposing for my own mac only. How can it be accessed from all devices ?? It was working till 12th of June starting from the day of my first deployment and suddenly stopped working without any new changes being pushed. I'm clueless now. cmd1 : nslookup frontend-production-9697.up.railway.app , output1:** server can't find frontend-production-9697.up.railway.app: REFUSED, cmd2 : nslookup frontend-production-9697.up.railway.app 8.8.8.8 , output2: output looks good, and same for backend.

PFA the output. Thank you for your suggestion btw. I'll try with custom domain option and let you know .

Thank you so much for you suggestions mate. I created domain in cloudflare and updated the custom domain for both frontend and backend (app.yourdomain.com and api.yourdomain.com) along with few variables and CORS in the main class . Now it started working fine for me from my mac and iphone as well 😊 would you mind explaining what's went wrong and why it stopped working while I was using up.railway.app? Thank you once again