On my Moto E (second generation) when I connect to open WiFi on Opera Mini v25 I always get the following error: "Verification of server certificate failed. Please check the date setting on your device."
This does not happen on WiFi at home or at work or if I use 3G. I have seen others report this but some are from 2011 and others are because of a firewall or something like AdAway which I am not using. If I uninstall and try to reinstall, setup fails with the following error: "Connection blocked. Try switching network".
If I try to test connection in advanced it just loads for a while and then gives a blank screen.
I am using Android 6.0 and am in England and my service provider is Talk Mobile. I can upload screenshots if that would help.