Cannot update - The operation couldn’t be completed. (NSURLErrorDomain error -3001.)(102)

Same problem.

A :-(

This problem is due to an issue on Apple's end. What that problem is is unclear, but when the same thing happened a month or so ago, one expert I know of was theorizing that it may have been a denial-of-service attack on Apple's servers.

In any case, there's only one thing you can do to solve the problem: wait. Give it a couple days and check for updates again.

I have exactly the same problem ...

I m really not fan of mountain lion, from the day i pass from lion to mountain lion i start to have plenty of little problem...

I m really not fan of mountain lion, from the day i pass from lion to mountain lion i start to have plenty of little problem...

That is not related to this problem. This is a server issue. I would advise you to start your own topic with details about the problems you are having, so that someone can help you solve them.

Thomas A Reed wrote:

(...)In any case, there's only one thing you can do to solve the problem: wait. Give it a couple days and check for updates again.

Exactly. Every works fine also for a day or two, ... :-)

Same issue !

The problem seems related to Apple server !