Cannot connect to internet after software update

I have an old powerbook G4 running Mac OS X 10.3.9 (this is one of 3 macs) I also have an airport Extreme and an airport Express to make a network in my home. Frequently, after a software update to the old computer, it has trouble getting back on to the internet. Usually, adjusting access to the Keychain fixes this.
Now, after a software update last week--I cannot get on the internet with this computer at all. The computer is connected to the network, the password is in the keychain, the signal is strong (all of the other computers can get on to the network)--but whenever I try to get on, I get 'cannot connect to the server'.
(btw, Last evening, the issue resolved itself for about 3 hours--I don't know why--but today it is out again.) Can anyone help?

Hi, Rathh. Always use Disk Utility to repair permissions immediately after installing any software update that uses Apple's Installer application, or that is installed by the Software Update function accessed through the Apple Menu.

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    Hi,
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    The eth1 is for test only. It is connected to a 8 port LAN switch, and there are 2 NAS connected to this switch.
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    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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    inet 10.10.12.50/24 brd 10.10.12.255 scope global eth1
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    link/ether 00:07:e9:01:a1:36 brd ff:ff:ff:ff:ff:ff
    inet 172.27.12.23/23 brd 172.27.13.255 scope global eth2
    inet6 fe80::207:e9ff:fe01:a136/64 scope link
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    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
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    link/ether 00:e0:81:27:32:60 brd ff:ff:ff:ff:ff:ff
    3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
    link/ether 00:e0:81:27:32:61 brd ff:ff:ff:ff:ff:ff
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    link/ether 00:07:e9:01:a1:36 brd ff:ff:ff:ff:ff:ff
    Last edited by guardkuo (2012-12-22 10:52:35)

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