check out cisco's document for upgrading from 6.x to 7.0 (assuming you upgraded to 7.04 from a 6.3 code- http://www.cisco.com/univercd/cc/td/doc/product/iaabu/pix/pix_sw/v_70/pix_upgd/pixupgrd.htm
"If you share the Stateful Failover update link with a link for regular traffic such as your inside interface, you must change your configuration before upgrading, as PIX Security appliance Version 7.0 does not support this configuration. The PIX Security appliance Version 7.0 treats the LAN failover and Stateful Failover update interfaces as special interfaces. In PIX Version 6.3 when an interface shares both regular traffic and Stateful Failover updates, the configuration related to the regular traffic interface will be lost after the upgrade if you do not change your configuration. The lost configuration may prevent you from connecting to the security appliance over the network."
