Mac Mini Server running Mountain Lion (10.8.2) is freezing during boot (last line: IPv6 packet filtering initialized)
Solution 1:
A possibility
The lack of progress, beyond the firewall-related message, may be unrelated to the firewall or networking. For example, these two lines from Intel Mac Pro Stuck on Gray Apple screen before OS load (2010-07-17):
IPv6 packet filtering initialized, default to accept, logging disabled
Jul 15 22:08:39 kextd[25]: kextd_watch_volumes: Couldn't set up diskarb sessions
– that's not to say that your issue may be the same; just to encourage thinking beyond networking.
Preliminary advice
Use Recovery OS:
- Disk Utility to verify the file system of the OS X startup volume
- verify permissions of the OS X startup volume.
Then – if the file system is OK – get the full installer for OS X (at another Mac, if necessary); install to the outdated Mac.