I have a new site VPN between a ASA5510 at head office and a Pix501 at a branch office. When I reboot the 501 the VPN comes up fine (i.e. I can ping devices at both sides). However, after approx 10 mins the connection drops and doesn't come back unless I reboot the 501 again. I have Pix 501's at 2 other sites connecting to the 5510 that work fine.
Can anyone point me in the right direction as to why this might be happening?