Cannot purchase from Mac App Store ("Connection failure" msg) I have a 2008 MBP with 10.7.4. I use a WIFI and ethernet connection. I cannot purchase or download anything in the Mac App store on my computer. I can, using other folk's computers. After putting in the password, I receive a red "Connection Failure" message. Despite this message, I can click on apps in the Store to read about them. I turned off Little Snitch to no avail. Everything else on the internet works just fine. No useful assistance from Apple. Any ideas?
Try this: log out of your iTunes account (within the App Store choose Store > Sign Out), restart your Mac and then try to purchase/download something.