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. https://crt.sh/?q=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: digital.lernzeit.org
I ran this command: nothing
It produced this output: over local network no problems, over mobile network (4G)
My web server is (include version): apache
The operating system my web server runs on is (include version): ubuntu 18.04
My hosting provider, if applicable, is: contabo
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):
If I am using my ios client to access my website over a local LAN connection everything works fine. But after a change to the mobile network I cannot access it. Chrome shows the message „ ERR_SSL_PROTOCOL_ERROR“ and Safari „no server response“. Also I use the HotSpot of my ios device it doesn`t work with Mac, ios, Windows and Android.
If I use the HotSpot of my android device it works without any errors from all other systems.
I really don`t know what is missing or incorrect.
Thanks for help and with best regards