I configured OpenVPN and setup one road warrior client on a phone.
It appeared to be working. I tested by turning off the wifi on the phone and it switched over to 4G and then I stated the VPN client. All appeared to be OK.
Fast forward a few weeks, and now the phone never connects.
I checked the obvious (to me) stuff like the vpn status on ipfire. Info on the certificate says it’s valid through 2023.
I have a limited knowledge in this area. What else can I look at?