Slow ssh and slow vsftpd login – Centos 6

The reason that the ssh commands were slow and sluggish (had to wait for seconds after enter was pressed to execute the command). There was nothing in the logs (that I could find) to help me identify this issue. I used google and many ideas from different forums without any luck.

I discovered that the changes I did to iptables some time before were wrong. Being a newbie I removed a rule that seamed suspicious (to me this rule looked too permissive):

ACCEPT all -- anywhere anywhere

To fix the issue I added the following rule back to my iptables. “This rule will allow all incoming packets destined for the localhost interface to be accepted.”

iptables -A INPUT -i lo -j ACCEPT

One thought on “Slow ssh and slow vsftpd login – Centos 6

  1. -sshd is checking DNS or reverse DNS:
    edit “/etc/ssh/sshd_config” and set “UseDNS no” remove comment
    -restart sshd:
    /etc/init.d/sshd restart

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