Find out which services are using which ports
netstat -tulpn
[root@main www.ewea.org]# netstat -tulpn Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 95.142.174.150:10022 0.0.0.0:* LISTEN 1289/sshd tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 6325/mysqld tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN 25106/perl tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 6360/vsftpd tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN 469/master tcp 0 0 0.0.0.0:10080 0.0.0.0:* LISTEN 5944/monitorix-http tcp 0 0 :::842 :::* LISTEN 1247/xinetd tcp 0 0 :::80 :::* LISTEN 1750/httpd tcp 0 0 ::1:25 :::* LISTEN 469/master udp 0 0 95.142.174.150:123 0.0.0.0:* 1297/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 1297/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 1297/ntpd udp 0 0 0.0.0.0:10000 0.0.0.0:* 25106/perl udp 0 0 2001:4b98:dc0:51:216:3ef:123 :::* 1297/ntpd udp 0 0 ::1:123 :::* 1297/ntpd udp 0 0 fe80::216:3eff:fead:9e49:123 :::* 1297/ntpd udp 0 0 :::123 :::* 1297/ntpd
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