Decrease the time wait before closing the sockets by entering:

# echo 3 > /proc/sys/net/ipv4/tcp_fin_timeout

Sometimes systems are now configured to prevent one from using a large number of ports, check the port range and modify if required.

# cat /proc/sys/net/ipv4/ip_local_port_range

This can be increased by issuing the following command

# echo "1025 65535" > /proc/sys/net/ipv4/ip_local_port_range

To have these new values take effect you might have to do (as root)

# /etc/rc.d/init.d/network restart

	# Allowed local port range
	net.ipv4.ip_local_port_range = 1025 65535
	# net.ipv4.tcp_tw_recycle = 1
	net.ipv4.tcp_fin_timeout = 3