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Have you followed the step by step suggested by Robbie...?

Got it!

Finder>Devices>My iMac>MacintoshHD>Library>Preferences>System Configuration>NetworkInterfaces.plist.

Thanks so much!

Ok, thanks for answering. I followed the instructions and deleted the file, now the app works fine. I hope the problem doesn't come back.

thanks that works fine. well done.

Thanks to everyone who's contributed here!

Trashing that NetworkInterfaces.plist file also fixed what I was already all but convinced would mean planning a call and trip to the local Apple Store to replace an apparently faulty Ethernet interface, since I could not connect that way either.

How can one file (NetworkInterfaces.plist) do so much, and cause such a widespread failure?!

What is its function, and how does it help in MAS certificates, please?

TIA!

oh... haven't tried after the fix (only seldom use it) but my ethernet connection too wasn't working

re what that file has to do with MAS... don't know and don't care (anymore): I immediately contacted the only two developers of critical, to me, apps I own so far only available from MAS and... they also are sick of it and going to offer direct versions asap 😉

and replaced right away my MAS 1Password license with developer's direct version (yesterday's MAS fail locked me out of all my pw =:-/ )

from now on I'll only buy from MAS $0.99c apps if I really have to: that's all it has proven being worth for!

Apple... :rolleyes:

I understand the frustration - of course. Apple isn't what it used to be, sadly.

I'm just thinking that if it were more generally known what role that file has in controlling these two things - and, specifically, why and how they're linked, we might avoid such frustration in future.

IOW, I followed these instructions to resolve my inability to get to any password via 1P, and - unexpectedly, the fix brought my Ethernet back to life!

Mark... here's what happened this weekend to our ethernet connections (and a fix): http://tidbits.com/e/16296

The question about how/*** this also leads to MAS issues remains unanswered :-/

Thanks, @plsvn, Yes - I think I'm OK now :-)

The only remaining puzzle is that my Ethernet connection in the Network System Preference pane doesn't show the <==> icon at its right hand side, but the blue Wi-Fi 'arc'. Is that normal? (AT&T UVerse connecting via Airport).

I ended up with the same icon swap, didn't notice it until yesterday.

I resolved it by going back and deleting:

com.apple.airport.preferences.plist

NetworkInterfaces.plist

preferences.plist

After rebooting the network icons were correct, the only thing I had to was reapply my fixed IP addresses and reset the DNS addresses.

FYI This solution appears to be the stock action for resetting the network settings in El Capitan.

@avidfcpfan

You've no idea how helpful that is - thanks so much! :-)

Will do as you kindly suggest…

same was happening here so searched and found this: http://osxdaily.com/2015/10/16/fix-wi-fi-problems-mac-os-x-el-capitan/

avid, though, ninja'd me 🙂

after rebooting some apps will ask you once more your MAS password :mad:

Thanks. Shall do that too.

Strictly speaking, I'm not having any trouble with either Wi-Fi or Ethernet as such now.

Just the wrong icon - and maybe things a little slower than before.

Half of me wants to leave well alone; the other half wants everything perfect.

I suppose some housekeeping couldn't hurt. Your lead appreciated.

Hi, unfortunately it won't work for me, after delete the file, reboot and sign in it still pop out that message. Why ?