Look for any connections being made to the outside world and figure out what they are. If you notice any kind of bugs or issues, report them here. The idea is to shut off all your known good programs and run TCPview. TCPView by Mark Russinovich (Sysinternals) RtlIpv6StringToAddressW function (msdn) RtlIpv4StringToAddressW function (msdn) RtlIpv4AddressToStringW function (msdn) GetOwnerModuleFromUdpEntry function (msdn) GetOwnerModuleFromUdp6Entry function (msdn) GetOwnerModuleFromTcpEntry function (msdn) GetOwnerModuleFromTcp6Entry function (msdn) CreateToolhelp32Snapshot function (msdn) When a client initiates the connection to a server, it sends a SYN packet first, if the remote server is available and functioning, the client should receive a SYN + ACK and the client would respond with an ACK and with this a TCP connection is formed.TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on your system, including the local and remote addresses and state of TCP connections. From Network perspective, TCP TIMEWAIT status is just a normal behavior that after closing the session, TCP stack will hold the high port for little more time to ensure the other side receive the last FIN-ACK packet and no more data will be received in this conversation. It is included in Microsoft Sysinternals. The app offers a display of opening and closing of ports and packet transfer in real-time. When you see a socket with this state, it is very likely that it has a problem with the Firewall (in this case block a port), although this state always happens, but should not last longer than a second (depending on the state of the network), but if it is maintained, there is a problem. Please refer to the following screenshot. TCPView TCPView gives a list of all the running processes and the open ports associated with them. Share Improve this answer answered at 18:14 Cakemox 24. netstat -b will give you the process information. To see the status of the available ports, and well, each port can have several states, for example a socket can be in LISTENING state or it may be in ESTABLISHED, but one of those that I saw and that prevented to execute some tasks was the SYN_SENT. You could use hping3 to send a tcp reset from the same source port to the same destination ip/port as the connection youd like to close.
Recently we had some problems with a DDoS attack on some machines that execute workers, so I started the task of configuring a firewall (before that, we just removed the machine and created a new one, they are machines without a state).
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