When I try to sign on to Mac App Store I get the message "Your device or computer cannot be verified" Yet I can sign on in iTunes no problem.  I've tried all the suggestions from App Support but no luck.

When I try to sign on to Mac App Store I get the message "Your device or computer cannot be verified" Yet I can sign on in iTunes no problem.  I've tried all the suggestions from App Support but no luck. What am I doing wrong?

What troubleshooting techniques have you tried? Have you restarted the app? Have you restarted your computer?
One idea is to Trash this file; Mac HD/Library/Preferences/SystemConfiguration/NetworkInterfaces.plist and restart.

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