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I have a PIX 501 running 6.3(5) that has started locking up, console and ethernet, then it reboots and locks up completely. As soon as any ethernet traffic is sent (ping, etc), it starts the lock and reboot. I've reset it to factory default and ref...
I had to remove it from production. It will run all day long with just the console connected. As soon as I attach my laptop to any of the ports (1-4) it resets with a watchdog timeout, dumps, then reboots and locks.