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Accepted
Antarr Byrd
Asked: 2017-03-19 23:27:06 +0800 CST

Free Port 80 for Caddy

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I'm trying to use port 80 on caddy but I'm getting an error saying the port is already in use. listen tcp :80: bind: address already in use. When I check to see what is using it this is what I get. 

sonar@SonarQube:~$ netstat -an | grep ":80"
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN     
tcp        0      0 10.1.1.5:42214          168.63.129.16:80        TIME_WAIT  
tcp        0      0 10.1.1.5:42222          168.63.129.16:80        TIME_WAIT  
tcp6       0      0 :::80                   :::*                    LISTEN

How can I kill whatever is running on 80? Could running sudo setcap 'cap_net_bind_service=+ep' /usr/local/bin/caddy cause it? If so how do I undo it ?

update (after adding -p)

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      -               
tcp        0      0 10.1.1.5:42768          168.63.129.16:80        TIME_WAIT   -               
tcp        0      0 10.1.1.5:42760          168.63.129.16:80        TIME_WAIT   -               
tcp6       0      0 :::80                   :::*                    LISTEN      -

update 2

tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      1316/nginx -g daemo
tcp        0      0 10.1.1.5:39152          91.189.95.83:80         TIME_WAIT   -               
tcp        0      0 10.1.1.5:49340          168.63.129.16:80        TIME_WAIT   -               
tcp        0      0 10.1.1.5:46654          91.189.88.161:80        TIME_WAIT   -               
tcp        0      0 10.1.1.5:48740          91.189.88.162:80        TIME_WAIT   -               
tcp        0      0 10.1.1.5:49314          52.176.58.79:80         TIME_WAIT   -               
tcp        0      0 10.1.1.5:49284          168.63.129.16:80        TIME_WAIT   -               
tcp6       0      0 :::80                   :::*                    LISTEN      1316/nginx -g daemo
linux

2 Answers

  1. Best Answer

    You need to add the -p switch to netstat so that you get the same of the program too. You'll need to run it as root/sudo as well.

    -p, --program

    Show the PID and name of the program to which each socket belongs.

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  2. You have nginx web server running on the server. Stop that with service nginx stop and you can start the other program.

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