When I am scanning my open ports, I found that server's telnet port is open. I did not expect to see that because I have removed telnet. So I lsof-ed the port and here is what server showed me.
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
xinetd 13131 root 5u IPv4 1797531 TCP *:telnet (LISTEN)
I guess this means that xinetd is listening telnet port. But I don't understand why it does that after telnet service is removed. xinetd has been restarted after telnet was removed.