Permanent connection to a chinese ip

My Ubuntu server had recently problems with a bruteforce attack. So I installed fail2ban and I think the problem is gone. But when I check iftop I see a Chinese IP permanently connecting. iftop 12.5Kb 25.0Kb 37.5Kb 50.0Kb 62.5Kb mqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqqvqqqqqqqqqqqqqqq Ubuntu-1510-wily-64-minim => 218.201.37.134 4.22Kb 4.12Kb 4.13Kb 194.97.114.3:2010 ts3server 898 root 39u IPv4 17862 0t0 UDP *:9987 ts3server 898 root 40u IPv6 17863 0t0 UDP *:9987 ts3server 898 root 45u IPv4 17867 0t0 TCP *:10011 (LISTEN) ts3server 898 root 46u IPv6 17868 0t0 TCP *:10011 (LISTEN) java 1050 root 46u IPv6 20495 0t0 TCP *:25565 (LISTEN) sshd 1220 root 3u IPv4 21663 0t0 TCP *:1022 (LISTEN) sshd 1220 root 4u IPv6 21665 0t0 TCP *:1022 (LISTEN) sshd 4347 root 3u IPv4 55148 0t0 TCP myip:ssh->mysship:50031 (ESTABLISHED) There are no logins (checked via last) that are not from me.