Ping but little else

I've got a network built around a Verizon-supplied Versalink 327W router at home. Two Linux boxes and my Lombard Powerbook (running) 10.3.9 can connect just fine, but I've got a weird problem with a 'new' 400mhz G3 iMac. It can ping my gateway and perform DNS lookups, but it can't ssh/ftp/http out. ie UDP works but TCP doesn't. It's got a valid and safe IP address. It's physically connected to the router over a known good cable and has been tested with a second one just in case. It's been plugged straight into the router and into an ethernet switch connected thereto.
I don't think there's a physical problem.
This machine did work on the network prior to running the updater, but magically stopped working shortly after.
Aside from the "page cannot be displayed" type errors that I get from TCP not working, the only error message I've gotten is a strange one. The Firewalls tab under System Preferences --> Sharing is all greyed out and says there's another firewall on my system that I have to disable, if I want to use the Apple firewall. However, dig as I might, I haven't been able to find any other firewall software.
Any ideas what could have caused this problem?
iMac G3 & G3 Lombard Powerbook   Mac OS X (10.3.9)  

Hi MrZaius,
I think I can help you with the second part of your problem.
Your firewall settings are greyed out because something you have installed has altered the firewall rules. Such an application is not necessarily another firewall but could be some piece of software that tries to optimise network throughput. These are usually found in /Library/StartupItems or even in ~/Libray/StartupItems. If in doubt, check your system.log for processes running on boot by opening "Console" in the "Utilities" Folder.
Anyway, in order to gain access to your firewall settings via System Preferences you will have to reset the firewall rules to their default state. To do so, login to your administrator account, open "Terminal" and type:
sudo ipfw flush
You will be asked first for your password and then whether you want to proceed (just answer yes by typing y).
-Petra

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