After a user upgrades the PIX 525 Firewall to software version 6.3(5), the "Cannot select private key" error message appears at the end of the reboot

[TCC_2]

Core issue

This error occurs due to old RSA keys that are present in the PIX Firewall configuration.

Resolution

In order to fix this issue, regenerate the RSA keys in the PIX Firewall with these commands:

Pix(config)#ca zeroize rsa

Pix(config)#ca generate rsa key 512

Pix(config)#ca save all

Pix#write memory

Pix#reload