Home Connection timeout Problem Solution

This morning found the new home node error, unable to connect some of the nodes found the problem, indicating little likelihood of service issues, I think of the problem is the kernel parameters. Because it really is a new node, there is no cause for system optimization. Recording problems in the process now found at:
1, view the connection status summary of what
netstat -n | awk '/ ^ tcp / {++ S [$ NF]} END {for (a in S) print a, S [a] } '
the CLOSE_WAIT 42 is
the ESTABLISHED 0
TIME_WAIT 1006
2, to optimize the kernel parameter
VI /etc/sysctl.conf
net.ipv4.tcp_syncookies. 1 =
net.ipv4.tcp_tw_reuse. 1 # = allow reuse TIME_WAIT state, so that even if all the ports filled TIME_WAIT by refusing new requests obstacle default is 0
net.ipv4.tcp_tw_recycle = 1 # 0 as soon as possible so that the default TIME_WAIT recycling
net.ipv4.tcp_fin_timeout = 30
/ sbin / sysctl -p # make parameters into effect
3, restart the java-related services
Although it is found in the operation and maintenance of common sense, but because of changes in the environment, may forget to record here.