Services stopped responding to requests after several updates

Question

This week all services on a G5 dual 1.8Mhz tower stopped responding. Unfortunately, I cannot find a trigger event for this though perhaps it is related to recent updates.
The services that stopped responding include bonjour, ssh, remote desktop/management, web server, and any services residing on an Airport Express (printing, AirTunes). Even ICMP pings will not respond.
All outbound connectivity works properly and I can access all the services locally.
On the surface it looks like a firewall problem, but no changes were made there and even with the FW set to "Accept all incoming connections", nothing gets through.
Using tcpdump, I can see the remote computers trying to access the services, but there is no response.
Also, during bootup, print jobs that were stalled because the printer on the Airport Express couldn't be found actually print and for s short time the system responds to pings, then stops.
There are lots of errors in the console at startup including the "SHAuthorizationRight" error (see below):
9/16/09 4:24:09 PM com.apple.launchctl.System[2] /dev/disk1s9 on / (hfs, local, journaled)
9/16/09 4:24:12 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/mach_init.d/dashboardadvisoryd.plist
9/16/09 4:24:12 PM com.apple.launchctl.System[2] launchctl: Please convert the following to launchd: /etc/machinit.d/fixprebinding.plist.obsolete
9/16/09 4:24:12 PM com.apple.launchd[1] (com.apple.blued) Unknown key for boolean: EnableTransactions
9/16/09 4:24:12 PM com.apple.launchd[1] (com.apple.RemoteDesktop.PrivilegeProxy) Unknown key for boolean: EnableTransactions
9/16/09 4:24:12 PM com.apple.launchd[1] (com.apple.usbmuxd) Unknown key for boolean: EnableTransactions
9/16/09 4:24:12 PM com.apple.launchd[1] (org.cups.cupsd) Unknown key: SHAuthorizationRight
9/16/09 4:24:12 PM com.apple.launchd[1] (org.ntp.ntpd) Unknown key: SHAuthorizationRight
9/16/09 4:24:12 PM com.apple.launchd[1] (org.x.privileged_startx) Unknown key for boolean: EnableTransactions
9/16/09 4:24:28 PM SecureClient[52] kextload: /opt/CPsrsc-50/boot/modules/vpn_kernsr.kext loaded successfully
9/16/09 4:24:28 PM SecureClient[52] kextload: /opt/CPsrsc-50/boot/modules/omdrv_kern.kext loaded successfully
9/16/09 4:24:29 PM SecureClient[52] kextload: /opt/CPsrsc-50/boot/modules/vna_kernsr.kext loaded successfully
9/16/09 4:24:30 PM SecureClient[52] kextload: /opt/CPsrsc-50/boot/modules/fw_kernsr.kext loaded successfully
9/16/09 4:31:16 PM com.apple.launchd[1] (com.apple.UserEventAgent-LoginWindow[98]) Exited: Terminated
9/16/09 4:31:16 PM com.apple.launchctl.Aqua[130] launchctl: Couldn't stat("/etc/machinit_peruser.d"): No such file or directory
9/16/09 4:31:16 PM com.apple.launchd[128] (com.apple.AirPortBaseStationAgent) Unknown key for boolean: EnableTransactions
9/16/09 4:31:16 PM com.apple.launchd[128] (org.x.startx) Unknown key for boolean: EnableTransactions
9/16/09 4:31:32 PM Dock[140] [QL ERROR] Generator database update takes too long... we will use what we currently have
9/16/09 4:31:33 PM Dock[140] [QL ERROR] Generator database update takes too long... we will use what we currently have
9/16/09 4:31:46 PM com.apple.launchd[128] ([0x0-0x18018].com.linotype.FontExplorerX.Autoload[166]) Exited with exit code: 255
9/16/09 4:31:56 PM SecurityFixer[176] No insecure startup items found!
9/16/09 4:35:39 PM Software Update[280] arguments=(null)
9/16/09 4:36:04 PM com.apple.launchd[1] (com.apple.installdb.system) Throttling respawn: Will start in 3 seconds
Thanks in advance for any help.

Answer 1

It took a couple days to figure this out, but I have answered my own question.
The problem was a security policy installed by a Check Point VPN1 connection to a particular remote site. Their policy turned off all local access on my G5. After deleting the site from VPN1 all services became available.
This really is a CheckPoint problem because I could not find any way to change the security policy to "unrestricted".