Software Update gets "NSURLErrorDomain error -1100"

Question

I'm getting a long hang and then  "NSURLErrorDomain error -1100" in the Updates tab of the App Store.  This happens both when I select the tab from within the App Store, or from Software Update in the apple menu.
I don't think I have anything that needs updating at the moment, but obviously I'd like this problem fixed!

Answer 1

If you have more than one user account, these instructions must be carried out as an administrator.
Launch the Console application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Console in the page that opens.
Select "/var/log/install.log" from the file list. Post the messages from the last installation or update attempt, starting from the time when you initiated it. If you're not sure when that was, start over and note the time.
Post the log text, please, not a screenshot. If there are runs of repeated messages, post only one example of each. Don’t post many repetitions of the same message.
Important: Some private information, such as your name, may appear in the log. Edit it out by search-and-replace in a text editor before posting.