I got a droplet yesterday, configured it to be a VPN by following the guide ( https://www.digitalocean.com/community/tutorials/how-to-set-up-an-openvpn-server-on-ubuntu-16-04 ) and it worked just fine untill suddenly about 3h in it disconnected me.
I checked the status - it was running but I couldn’t ssh into it. I reset the root password and logged into console. ssh is running, the droplet can ping outside the network etc.
http://i.imgur.com/c8sTWZm.png
I’ve not made any other changes to the droplet other than following the guide to the letter.
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What error do you get when you try to connect to ssh?
Can you post your ssh config in /etc/ssh/sshd_config?
And if possible output of sudo iptables -S.
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