Update OS 10.5.5: no more internet connection after update to 10.5.5

Since updating to 10.5.5 yesterday, I can not connect to the internet nor email anymore.
My Time Capsule (Airport) is working fine because I can connect using my iPod Touch that is also using it.
By the way, I've sent this message using the Explorer browser in Windows XP, running on the SAME Mac with Parallels emulation, which is working fine. Strange, hm?
I suspect the bug is in the update. Now I wonder how we are going to do Software Update without internet connection.
Anybody have the same experience?

This thread caught my eye, because I have spent a lot of time trying to help people with internet problems... and the solved status made me curious! There seems to be a few people with the DNS changer trojan horse at the moment..
I wonder how it got there.
Trojan Horses are usually installed when you agree to provide your admin credentials to install some software (whilst visiting a website).
Installing software from the net that you have not explicitly verified first (through mac forums) is generally a bad idea. Once you have given a process your admin credentials, it can do whatever it wants to your system.
This is also a reason why it is a bad idea to run your regular usage as an Admin user. It is possible to install software as an Admin user without entering any username/password - and it can easily give itself root access to your computer.
Cheers,
Rodney

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Hello
Sorry, I have no answer to your problem. I just want to share that I amexeprience similar issues with my iMac since I upgraded to Snow leopard :
The LAN connection of the iMac slows down after accessing Internet, usually less that one hour. I can measure it through an Internet throughput utility on my provider's home page.
I have two Macs connected on the same DSL box, with the same OS version, Snow leopard, and nearly the same sofwtare configuration. Thus I can compare the Internet access speed :
After starting the computers, it is above 12 Mb/s.
On the iMac that I use most for Internet, it slow down to more or less 2 Mb/s after a few minutes, whereas it stays at 12 Mb/s on the MacMini.
Because of this, I believe it is LAN problem, not an Internet/DSL problem.
The same phenomenon happens if I connect to my DSL/Router with Ethernet or with Airport. The speed drops to similar values, below 3 Mb/s. Thus, the problem dose not seem to be related to LAN connection hardware.
Curiously, the speed is high again after shutting down and restaring the iMac. But it slows down again after a few minutes. Putting the computer to sleep does not help to restore maximal speed: it has to be shut down.
From all this, I draw the conclusion that the problem lies in a LAN software layer that is common to Ethernet and Airport and that is restarted only after shutdown.
I am using the MacMini as a reference for Internet access performance, in order to have a benchmark for iMac performance. I hav enot tried yet if the LAN performance of the MacMini collapses in a similar way if I use it to surf on the net.
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Hi
I have install the new update firmware for my ipad 2 (5.0.1) and immediatly after not internet connection possible. My setting have been erase (same with my ipod itouch update). I try to connect at my routeur with right password but doesnt working .... I have already install update last time and never have this problem.
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thanks of advance.
Thekeep

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 Cheers, Tom

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Hello Coldwater Card,
Please try the following steps and let us know if this fix your issue :
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Follow these steps to see if there is a problem with your hosts file and to reset it if necessary.
Click this link.
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In January, I posted the question below. I wanted to update it, but this site has archived it and will not allow responses. In the hope that I may help someone else, I am repeating my question, now that I have the answer.
===============================================
ORIGINAL PROBLEM
Last week, I upgraded from 10.3.9 to Tiger. Ever since then, I have had trouble using Apple's programs that require internet usage: Safari, iTunes, Software Update, etc. All of these programs think I am not connected to the Internet. But I am; I can use Netscape, Internet Explorer, and other non-Apple programs on the web.
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How can I resolve this?
==============================================
The problem was that my Earthlink Access software was setting a proxy on my connection. Netscape & Firefox worked because they ignore any proxies; the Apple programs (plus Shiira and Internet Explorer) didn't connect because they use the proxies.
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Movable flat-screen iMac G4 Mac OS X (10.4.6) 1.25Ghz processor, 256 MB memory (DDR SDRAM)

For the record, could you state each Proxy box you ended up unchecking please? I'll attempt to submit a user tip with credit to you for finding this solution.

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Update OS 10.5.5: no more internet connection after update to 10.5.5

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