Can anyone please help an old soldier. I have a Galaxy A8 (2018) and the WiFi works perfectly at home. Today I was in the pub and wanted to use a discount voucher on my phone so went to Settings - Connections -WiFi and chose the pub Wifi which was 02. After a short while it said 'Connected' BUT when I tried to do anything I got the message 'Unable to connect to a secure server'. I turned on mobile data but still got the same message even though it originally said 'Connected' I have had this problem before but with a different phone in a different pub. Any help most appreciated.