OK - I have almost made it. I made port fowarding on my router and now it is communicating but in my windows 8 client (I use OpenVpn GUI as a administrator) I get connection failed error and there is such a text in log file:
"No server certificate verification method has been enabled"."
THis is log file when I was trying to connect using my mobile LTE internet:
Thu Jul 31 12:44:37 2014 OpenVPN 2.3.4 i686-w64-mingw32 [SSL (OpenSSL)] [LZO] [PKCS11] [IPv6] built on Jun 5 2014
Thu Jul 31 12:44:37 2014 library versions: OpenSSL 1.0.1h 5 Jun 2014, LZO 2.05
Thu Jul 31 12:44:37 2014 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Thu Jul 31 12:44:37 2014 UDPv4 link local: [undef]
Thu Jul 31 12:44:37 2014 UDPv4 link remote: [AF_INET]80.53.194.202:1194
Thu Jul 31 12:44:50 2014 [lubuntu] Peer Connection Initiated with [AF_INET]80.53.194.202:1194
Thu Jul 31 12:44:53 2014 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Thu Jul 31 12:44:53 2014 open_tun, tt->ipv6=0
Thu Jul 31 12:44:53 2014 TAP-WIN32 device [Local Area Connection] opened: \\.\Global\{E436FBAA-5E80-4390-B6AD-2A8040A58459}.tap
Thu Jul 31 12:44:53 2014 Notified TAP-Windows driver to set a DHCP IP/netmask of 10.8.0.6/255.255.255.252 on interface {E436FBAA-5E80-4390-B6AD-2A8040A58459} [DHCP-serv: 10.8.0.5, lease-time: 31536000]
Thu Jul 31 12:44:53 2014 Successful ARP Flush on interface [24] {E436FBAA-5E80-4390-B6AD-2A8040A58459}
Thu Jul 31 12:44:58 2014 Initialization Sequence Completed
Thu Jul 31 12:45:09 2014 [lubuntu] Inactivity timeout (--ping-restart), restarting
Thu Jul 31 12:45:09 2014 SIGUSR1[soft,ping-restart] received, process restarting
Thu Jul 31 12:45:11 2014 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Thu Jul 31 12:45:11 2014 UDPv4 link local: [undef]
Thu Jul 31 12:45:11 2014 UDPv4 link remote: [AF_INET]80.53.194.202:1194
Thu Jul 31 12:45:23 2014 [lubuntu] Peer Connection Initiated with [AF_INET]80.53.194.202:1194
Thu Jul 31 12:45:26 2014 [lubuntu] Inactivity timeout (--ping-restart), restarting
Thu Jul 31 12:45:26 2014 SIGUSR1[soft,ping-restart] received, process restarting
Thu Jul 31 12:45:28 2014 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info.
Thu Jul 31 12:45:28 2014 UDPv4 link local: [undef]
Thu Jul 31 12:45:28 2014 UDPv4 link remote: [AF_INET]80.53.194.202:1194