HT1507 I do not see a firewall tab when going to System Preferences Sharing?

I do not see a firewall tab when going to System Preferences>Sharing.
I am unable to make or receive iChat video calls.
Trying to figure out what is going on with my router.

Hi,
For others.
The Firewall is in System Preferences > Security > Firewall
There are then slight variances in Leopard and Snow Leopard/Lion about when you turn it ON and when you can access the Advanced Button
If it is set to ON then you need to go to the Advanced Button and Enable Allow Signed software
You may also need to add iChat (Or message beta) to the List.
NOTE
Enabling Stealth will stop iChat/Messages from working.
8:28 PM Wednesday; March 28, 2012
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
 iMac 2.5Ghz 5i 2011 (Lion 10.7.3)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
"Limit the Logs to the Bits above Binary Images."  No, Seriously

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Firewall tab greyed out in System Preferences - have I been hacked?

Hi,
I am running 10.4.11. In System Preferences, under Sharing, the Firewall tab is greyed out, suggesting my firewall is not running or has been tampered with.
So I did some poking:
brendan% sudo ipfw show
02000 844220 100107534 allow ip from any to any via lo*
02010 0 0 deny ip from 127.0.0.0/8 to any in
02020 0 0 deny ip from any to 127.0.0.0/8 in
02030 0 0 deny ip from 224.0.0.0/3 to any in
02040 0 0 deny tcp from any to 224.0.0.0/3 in
02050 388115 29754604 allow tcp from any to any out
02060 690200 900600320 allow tcp from any to any established
02065 0 0 allow tcp from any to any frag
02070 0 0 allow tcp from any to any dst-port 123 in
02080 0 0 allow tcp from any to any dst-port 135 in
02090 0 0 allow tcp from any to any dst-port 8135-8137 in
02100 0 0 allow tcp from any to any dst-port 21 in
02110 0 0 allow tcp from any to any dst-port 500 in
12190 0 0 deny log tcp from any to any
20000 0 0 deny log icmp from any to me in icmptypes 8
65535 92033 23684897 allow ip from any to any
Does this look suspicious? I also tried:
brendan% /usr/libexec/FirewallTool
Firewall Tool: Error, sysctlbyname(net.inet.tcp.blackhole): 1
Firewall Tool: Error, sysctlbyname(net.inet.tcp.loginvain): 1
Firewall Tool: Error, sysctlbyname(net.inet.udp.blackhole): 1
Firewall Tool: Error, sysctlbyname(net.inet.udp.loginvain): 1
Firewall Tool: Error, sysctlbyname returned: -1
Firewall Tool: Error opening socket
Firewall Tool: Error 1, Error setting up V4 Firewall!
Firewall Tool: Error opening socket for V6!
Firewall Tool: Error 1, Error setting up V6 Firewall!
Should I be concerned? Am I being paranoid?
If I want to reset and restart my Firewall, how do I do that, if the tab is greyed out in System Preferences?
If I want to load a backup copy of my firewall configuration, what file do I need to copy from my backup disk? There is no /etc/firewall.conf on my system.
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As I recall, if you do any sort ipfw stuff in command line under Tiger, that that made Sharing > Firewall gray out. Try doing a sudo ipfw flush then see if that lets you reconfigure from Sys Prefs.
This article discusses Tiger's default firewall settings with web sharing turned on. That will give you a start in seeing what you should have on. This article may help a little, too, if you are running services or have certain softwares doing different things (gaming, etc.)
Hope this helps some; sorry I can't help you more.

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HT1507 I do not see a firewall tab when going to System Preferences Sharing?

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