Hi, I've got a networking problem with the auto update function on the three Macs I use (2 G5s and a MacBook). Once I confirm that I would like to download and install new software updates I get a message saying:

None of the updates could be installed. A networking error has occurred: Forbidden (-1102)
Make sure that you can connect to the internet and try again.

I am on the LAN network at work and can access the internet. I can also download and install software updates direct from apple.com but this is a pain as I have to find all the serial numbers for every individual application.

I googled the error code and it is listed as an Appletalk ATP error - control block not found - no pending asynchronous calls. What?

Anyone got any ideas? Help would be greatly appreciated.