How can I monitor network in CentOS .5.5 , my application refuse to read sockets

Question

I have weird problem with one of my applications (servers ), its suddenly starts to read socket and before it written back, the connection is closed this is what I see in my logs. Is there any tool in Linux centos that let me see what is happening in this time frame some tools to debug the network ?

Answer 1

Use tcpdump or wireshark. tcpdump is a common packet analyzer that runs under the command line. Wirehark is GUI application.

Also you can use strace to trace system call.

Answer 2

Along with wireshark and tcpdump, you can also log everything through iptables. Depending on how your firewall is set up, a log rule would look something like "-A INPUT -j LOG"