Ping will break in cisco pix firewall vpn

I built up a vpn by cisco firewall 501 and 506, when ping through, it will break once around every 5 mins.
Any detail suggestion? thanks
turbot_yuAsked:
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Pete LongTechnical ConsultantCommented:
The command means every 10 seconds make sure the connection is up :)
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Pete LongTechnical ConsultantCommented:
>>it will break once around every 5 mins

Are you sure its not simply timing out?

enter the following command (on both Firewalls)

isakmp keepalive 10
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turbot_yuAuthor Commented:
what does the command means?

I tried to setup a syslog server on my pc, but failed.

I logged into http server inside the FW found some info log as below, but seems no use.

302014: Teardown TCP connection 7008 for outside:172.20.0.72/9001 to inside:172.....
302013: Built outbound TCP connection 7009 for outside ....................
605005: Login permitted from .....................
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Pete LongTechnical ConsultantCommented:
ThanQ
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