Assuming your CNAME/TXT records are set correctly, try accessing the URL from an incognito window.

from incognito get same result

Can you share your custom domain?

I have same isssue

myrenta.uk

You need to add CNAME and TXT records to your domain.

I did for xxx.myrenta.uk but not working

I'm getting a different error. Check your deployment logs and see if there are any errors.

the internal url generated by railway works fine just my custom domain

I assume the port your custom domain is mapped to is the same port as your application?

yes... changed it to 8080 now and it works

its on 8080

Yes, but is your application listening on 8080?

railway domain work as expected on port 80

custom port does not work for port 80 and also for port 8080

the issue now is that https is invalidated and also blocked by ISP

Try accessing from an incognito window. I can access your URLs just fine.

same issue even ports are same, default url is working but both backend and frontend sub-domains are giving this, even though my other sub-domains are working fine

Can you share the domains you're trying to access?

https://api.abc.com/

https://app.abc.com/

any idea?

original thread still relevant

https issue

The certificate for this site is not valid.

Because this connection is not secure, information (such as passwords or credit cards) will not be securely sent to this site and may be intercepted or seen by others.

We suggest you don't enter personal information into this site or avoid using this site.​

in addition ISP block the domain i bought from railway.com

Try accessing the URL form an incognito window. Your browser might be caching a stale invalid certificate.

Try this 2 things it will work i guess

1. try to open this link via any proxy browser online so you can first check if any issues not with DNS cashing in your browser if that is issue and you can work on invalidate cache and all. But first check proxy servers so you get idea if it running or not actually.

2. If this is your spring boot application do not specify server.port property. this might be also applicable for other apps also. Remove specified port and let railway to do the magic.

Try this your app will run for sure

It works for me, no errors with https.

I used cloudflare and used a subdoman, i think the setup is different for root domains but since it works here i think its the cache as many other has said herel.

I was also inpatient and changed setting before letting some time go by, exactly when i was about to skip doing it by sub domain and do it via root domain instead it suddenly worked and since i used cloudflare there were even a connect to cloudflare button that should have set it up for me but didnt workin the start for me.

I used port 8080 for my port at the external domain, since in my case at least there is a Caddy between the visitor and PHP backend so:

From: https://docs.railway.com/networking/domains/working-with-domains

'''

Target ports

Target Ports, or Magic Ports, correlate a single domain to a specific internal port that the application listens on, enabling you to expose multiple HTTP ports through the use of multiple domains.

Example -

https://example.com/ → :8080

'''

Then if there is something special for root domain idk.

You could also try and remove the ssl cert all together and add a new one a few hours or a day later (dont remember how often they check re-newals or creation of new ssl certs but according to AI that can help, i struggled with this issue for a long time so picked up a few things a long the way.

At least your domain gets pointed to railway so the issue seems to be somewhere here, i used claudflare and with some settings i got error at claudeflare site with their proxy, what DNS hosting provider are you using(shouldn't mather if the request gets thru i belive but be sure to read thru all the docs in the link i posted above and related links and ask AI about the problem?

fixed , added another custom domain start www.