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The PIX software differentiates between lack of traffic on the failover serial cable and lack of the cable itself. You are disabling scenario 1 by removing the cable.
I was able to type this into a 515 running 6.3.3 with no problemanc-cwc-pix1(config)# access-list 115 permit ip 192.168.1.0 255.255.255.0 10.3$anc-cwc-pix1(config)# access-list 115 deny ip 192.168.1.0 255.255.255.0 anyanc-cwc-pix1(config)#you could t...