Extreme 802.11n 100BaseT - drops out when Time Machine starts -no USB disk

Question

I've got a strrange problem I'm troubleshooting at present - symptom being that once hourly the Airport Express drops off - yellow flashing light, all DHCP connections stop etc, and then recovers after a 30 second or so period. Log shows the following:
Dec 28 07:56:47 Severity:5 Connection accepted from ::ffff:10.0.1.12/54766.
Dec 28 07:56:48 Severity:5 unloading current configuration.
Dec 28 07:57:10 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 3).
Dec 28 07:57:10 Severity:5 Deauthenticating with station ff:ff:ff:ff:ff:ff (reserved 2).
Dec 28 07:57:10 Severity:5 Rotated TKIP group key.
Dec 28 07:57:19 Severity:5 Internet Configuration leased -- host <202.27.xxx.xxx/255.255.255.0> gateway <202.27.xxx.xxx> dns <202.27.xxx.xxx> wins lease <300> domain <home>
Dec 28 07:57:21 Severity:5 Clock synchronized to network time server time.asia.apple.com (adjusted +0 seconds).
Dec 28 07:57:25 Severity:5 (WAN) link state is Up.
The machine 10.0.1.12 is my Leopard server, which is backing up using time machine hourly (xx.56ish) to a firewire connected disk. Steps I've taken to troubleshoot include:
Removing the USB connected disk on the Airport Extreme - no change
Switiching the Airport Extreme to a different power supply board - no change
Rebooting the Airport Extreme, setting up an additional profile - no change
Note that the server is connceted to the base station by ethernet, not wifi. 6 or so other machines are connected by wifi, and a printer is also connected by ethernet.
Is anyone seeing anything similar? Most disruptive behaviour!

Answer 1

Gullah Betty wrote:
The young man had me to click on the internet tab of my time capsule (the one next to the airport tab). He then had me click on the TCP/IP tab and change the DNS Server.
That makes sense, although it could have been hoped that your ISP's DHCP server would have supplied the Time Capsule with the correct DNS value(s).
My local area connection is a direct connection from my modem to my Sony.
I imagine you don't normally have your broadband modem (that "UBEE D3.0"?) connected to the Vaio, right? Unless your modem has a second Ethernet port, I imagine that it's normally only connected to your Time Capsule.
I only keep it available because whenever I have to call Comcast, the first thing that they ask me to do is to make a direct connection from my Sony to the modem. And they also refer to it as the host computer. I do not keep this connection active at all times.
I understand. That's a routine troubleshooting technique, in that it removes as much equipment as possible from the connection chain. However, for the purposes of this discussion, calling that "the host computer" is irrelevant and potentially confusing.
I have Windows XP Professional 5.1.2600, SP3.
That's the latest version. It should be capable of connecting. If you have your Vaio connected via WiFi and via an Ethernet cable, I wonder if that's confusing Windows. In that case I'd disconnect the Ethernet cable to see if things work better that way.
One other technique that you may already be using: When you switch what device is connected to your broadband modem, for a lot of modems it's necessary to power the modem down for several minutes to convince it to connect to a new device.