I lost my internet connection since 10.4.5 update.. PLEASE HELP

my imac is connected to a pc through the built-in ethernet to get the internet connection from it. Since the update of 10.4.5 I lost the connection to the PC!!!! I tried several things but no luck. can you help? (I am writting from my PC right now.. yuuuuk)
Message was edited by: Gh0st
Guys.. i just managed to fix the issue. Sorry for the shout.

Same thing happened to me with 10.4.4 Turns out this App I was running was the x-factor.
Peer Protector. Internet ran fine until I launched that app.
Don't know if you guys are running it, but the only way I could get my internet back was an archive & install of original tiger cd. I then applied 10.4.3 combo update; voila, everything fine.
Never before did I have a problem with Apple updates; since then I don't plan on going near those bad boys with a 10 foot pole.
Since this update came so soon after 10.4.4, I can only assume they are addressing some of the major issues with it- I read some CRAZY things happening to people, and I found other people who had the problem I had with Peer Protector.
So my advice? Archive & Install, especially if you have no idea what is causing the problem or the app is vital to your system use.
It's a *****, but it leaves all of your User files alone and just replaces the system files. It also sets the files aside in "Previous System" folder.
10.4.3 works fine, a couple extra widgets & security updates aren't enough to tempt me. Not after my 12 hours of maintence of my comp/calling tech support to figure out the problem- and believe me, your ISP will have NO clue what the problem is, you'll have to figure it out yourself.
Being the slacker that I am and the fact that I've filled my external 200 GB Firewire 800 HD, I didn't even bother to back up my system. Risky? Probably. At that point however, I didn't care.
Good Luck!

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I have a MacBook running Mac OS 10.4.11 with the latest updates.
Intel Core2 Duo @ 2.16 Ghz
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Try this cure for Security update...
http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0
Cure for Security update...
http://discussions.apple.com/thread.jspa?threadID=1730909&tstart=0
http://discussions.apple.com/thread.jspa?messageID=8309498#8309498

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