When I was today installing openvpn once I had everything configured, I got these errors.

On the server side.

Connection refused (code=111)

and on the client side.

TLS Error: Unroutable control packet received

After googling for a while I found the solution, all have to be with the time in both sides (server and client) so the solution is.

install rdate

apt-get rdate

and then sync the clocks on both pcs.

rdate -s