SSL doesn't work on phone

[nicitaacom]

My domain is: hot-delivery.net

I ran this command: Deployed on vercel

It produced this output: ?

My web server is (include version):
IDK - vercel configued

The operating system my web server runs on is (include version): IDK

My hosting provider, if applicable, is: Vercel

I can login to a root shell on my machine (yes or no, or I don't know):
ITS NOT VPS! - so I don't have access to terminal
I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
ITS NOT VPS
The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):
IDK

SSL certificate work on laptop
SSL certificate doesn't work on phone
Why?
How to fix it?

[mcpherrinm]

It works on my phone.

You will need to provide more information. What is the phone it doesn’t work on? Operating system and browser with versions would be best.

What is the exact error you get? Maybe with a screenshot.

Vercel support may be more equipped to help you as well.

[nicitaacom]

Galaxy J3 (2016)
Model: SM-J320H
Android: 5.1.1
Chrome:95.0.4638.74

[nicitaacom]

[webprofusion]

Your version of Android is too old to use current Let's Encrypt certificates. You need 7.1.1 or higher to trust the ISRG Root X1 root certificate (which was issued in June 2015) Certificate Compatibility - Let's Encrypt

The easiest workaround would be to try a different CA, but as vercel host your site I assume it's unlikely that you control that.

[petercooperjr]

Presumably, devices that old would have trouble accessing much of the Internet (any site using Let's Encrypt), including sites like this forum?

[9peppe]

They can use Firefox, or even install the appropriate root certificates in the system store, if possible.