I cannot download file in my website when user android mobile

Please fill out the fields below so we can help you better. Note: you must provide your domain name to get help. Domain names for issued certificates are all made public in Certificate Transparency logs (e.g. crt.sh | example.com), so withholding your domain name here does not increase secrecy, but only makes it harder for us to provide help.

My domain is: job.sciplanet.org

I ran this command:

It produced this output:

My web server is (include version): apache

The operating system my web server runs on is (include version): win2019 64bit

My hosting provider, if applicable, is: self host

I can login to a root shell on my machine (yes or no, or I don't know): yes

I'm using a control panel to manage my site (no, or provide the name and version of the control panel):

The version of my client is (e.g. output of certbot --version or certbot-auto --version if you're using Certbot):

HERE my problem

I cannot download PDF file in my website when use android mobile with LINE APP and MESSENGER APP. it work fine when use browser here link https://job.sciplanet.org/upload/1638155103.pdf
when use that APP its say not secure

Welcome to the community @Phichie2

Your server is only sending the "leaf" certificate but it needs to send all the intermediates too. I saw from your server response headers you are using Apache version 2.4.46. With that version you should have lines something like:

SSLCertificateFile    (your path)/fullchain.pem
SSLCertificateKeyFile (your path)/privkey.pem

Your SSLCertificateFile right now is probably referring to cert.pem instead

You can check your certificate now and after the change using this

Updated to note specific Apache version


Thanks, @MikeMcQ. It works fine and please close this topic.