localhost.http syn_sent


U.S.D.A. Prime
That means that a request has been sent to the remote machine, but no RST or ACK/SYN has been received yet.

This is typically caused by one of two things:

1) Something with your firewall or the remote host's firewall is preventing communication.
2) The remote host has gone down (i.e., is no longer connected to the network) and/or is not responding anymore.