knockd.conf

[options]
    logfile   = /var/log/knockd.log
#    interface = eth-intel
    interface = eth-realtek

[SSH]
    sequence      = 52966,14256,22827,17238,45857,31846,45236,14444,29713,1305
    seq_timeout   = 20
    start_command = /usr/bin/ufw allow from %IP% to any port 22
    tcpflags      = syn
    stop_command  = /usr/bin/ufw delete allow from %IP% to any port 22

[Nginx]
    sequence      = 32596,33256,1123
    seq_timeout   = 30
    start_command = /usr/bin/ufw allow from %IP% to any port 1935
    tcpflags      = syn
    stop_command  = /usr/bin/ufw delete allow from %IP% to any port 1935