Network: a problem about 'Connection reset by peer'

When I log in a remote computer by ssh from my home and if I keep it inactive for a while (for example, 10 mins), I often was kicked out with the message, for example:
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Read from remote host jasper-clued0.fnal.gov: Connection reset by peer
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This happened probably because a firewall or other packet filtering device (such as your router) drops idle connections after a certain period of time.

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A solution based on the ssh server side can be found here (Dugan provided me with this solution):

http://www.brandonhutchinson.com/OpenSSH_ClientAliveInterval.html

Simply speaking, the solution is add a line

ClientAliveInterval 300

in the file:

/etc/ssh/sshd_config

and reload the sshd server configuration with

/sbin/service sshd reload

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Another solution based on client side provided by my colleage Horst at Fermilab is: to add

echo 300 > /proc/sys/net/ipv4/tcp_keepalive_time

into the file /etc/rc.local

D0:software:network: my laptop is blocked

Fnal has a network policy, and my laptop is blocked since I open X window without certificates. The method to solve it is to import certificate to my browser. Follow the instruction on the given link. but I don't have kx509 installed. I cannot find any on network (since links are dead), so I find there is kx509 installed and copy it and its corresponding libs to my local laptop. and run the script get-cert.sh with -i, works.