root@274531:/home/alexander# sudo docker start sql1
Error response from daemon: driver failed programming external connectivity on endpoint sql1 (9e373759620e02e80812daec2032bceb837b0aa2e045cac95f70c4231a776dd3): Error starting userland proxy: listen tcp4 0.0.0.0:1433: bind: address already in use
Error: failed to start containers: sql1
root@274531:/home/alexander# netstat -tulpn
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      614/nginx: master p
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      518/systemd-resolve
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      597/sshd: /usr/sbin
tcp6       0      0 :::80                   :::*                    LISTEN      614/nginx: master p
tcp6       0      0 :::22                   :::*                    LISTEN      597/sshd: /usr/sbin
udp        0      0 127.0.0.53:53           0.0.0.0:*                           518/systemd-resolve
udp        0      0 85.143.174.177:68       0.0.0.0:*                           389/systemd-network