How do you force a socket to close?

How do you force a socket to close?

Closing a socket in a running process is not impossible but difficult:

1. locate the process : netstat -np. You get a source/destination ip:port portstate pid/processname map.
2. locate the the socket’s file descriptor in the process lsof -np $pid.
3. Now connect the process: gdb -p $pid.
4. Now close the socket:

What happens when you close a socket?

close() call shuts down the socket associated with the socket descriptor socket, and frees resources allocated to the socket. If socket refers to an open TCP connection, the connection is closed. If a stream socket is closed when there is input data queued, the TCP connection is reset rather than being cleanly closed.

When do I need to close a socket in TCP?

If the socket is a TCP socket and it is connected, then the TCP connection will not be closed unless the socket is closed or shutdown() is called. Therefore, in this case, you should at least make sure to call shutdown() if you can’t close the socket.

What happens if I Don’t Close a socket?

If the socket is a listening socket ( listen () has been called on it), the system will continue to accept connections on this socket if you don’t close it (but only up to the backlog limited specified in listen () ).

Is there a way to close a port?

In order to close the port you could identify the process that is listening on this port and kill this process. CurrPorts did not work for us and we could only access the server through ssh, so no TCPView either. We could not kill the process either, as to not drop other connections.

What happens when a TCP connection is dropped?

TCP sockets don’t automatically close at all. However TCP connections do. But if this is happening between peers in the same computer the connection should never be dropped as long as both peers exist and have their sockets open. Thanks for contributing an answer to Stack Overflow!