I have two ASA-5520 firewalls running in an Active/Standby setup. One of them did not start and displayed the following message on the console during boot:
From my experience, the message Booting system, please wait… can be caused by a faulty memory, and so I was going to check the hardware.
The ASA-5520 has four memory slots, where two of them are occupied and give the system 2GByte of RAM. I removed one of them, booted the ASA5520, and it came up as expected.
To cross-check, I removed the other memory, inserted the one I removed first and booted the ASA5520. Same error: Booting system, please wait…. Therefore I knew the memory I removed first is the faulty one.
By booting up with one memory installed (1 GByte instead of 2 Gbyte) the ASA5520 shows a warning that the memory requirements are not met to run with the ASA software I am normally running:
Because I do not want to downgrade my ASA software, I keep this one running in my Active/Standby setup and ordered a memory replacement, which will hopefully arrive soon.
And if you enjoy some hardware photos, here is one of my ASA-5520’s running as Active/Standby. Enjoy!