When I try to update from the app store I get error C08229p

Question

Hello,
When I try to update from the app store on my iMac I get an error. An error has occured cannot connect to software update server (C08229p). Does anyone know how to fix this. The computer is connected to the internet. I have tried to boot in safe mode but still get the error. I can't update anything. Can anybody help?
Thank's
Mimi

Answer 1

Triple-click the word "telnet" in the line below on this page to select the whole line:
telnet swscan.apple.com 443
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal 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 Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
You should almost instantly get three lines of output below what you entered, the last of which is this:
Escape character is '^]'.
If there's no output within ten seconds, consider that a failure. Otherwise, please post the output in a reply. You can then quit Terminal.