Hi,
I have CentOS 5.0 server. It acts as router. Its serving for web
application,SSH and VSFTP purposes. I have restricted iptables by mentioning
IP from where these services to be accessible. Sometimes this server is not
responding. Whenever I have this issue, its started to respond again after
restart the server. After restart the server, I have checked firewall rules
using "iptables -L". Here I can see unwanted entries which I didnt include
in iptables rules. I am afraid that server has hacked by someone.
Kindly guide me to avoid this kind of situation.
Thanks for your time.