Because the server is in a intranet environment.
Every time when connect to services: SSH MySQL FTP
It will take from 20 second to 6 minutes to connect into server.
Which in some case like FTP client will tell you "Time Out"
The reason cause this issues is: Reverse DNS lookup
To fix this:
1.SSH
# sed 's/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config -i
# service sshd restart
2.MySQL
# vi /etc/my.cnf
Add:
[mysqld]
skip-name-resolve
3.FTP
# vi /etc/resolv.conf
use "#" to disable the intranet server like:
#nameserver 1.2.3.4
#nameserver 5.6.7.8
Done.
