An unknown error has occurred app store

I tried everything here then found another site with information which worked.

I can not find where the post was with the instructions but I did this,

1. open system preferences.

2. go to network settings

3. delete the etehrnet by sleceting and hitting -

4. reboot in safe mode like this, it takes quite a whiel to start up as it performs checks.

After the logo appears, you should see a progress bar during startup. This indicates that your computer is performing a directory check as part of Safe Mode.

5. go to system pereferences

6. network settings.

7. click the + and add ethernet

8. apply

9. Now reboot again. (NOT in safe mode)

10. you may be able to login at this point. I could not.

11. BUT when I went to the app store, "store" menu "sign out" was now showing.

12.. I signed out, logged back in and all was well.

As the post I read for these instructions said, I see no logic to why your Ethernet setup effacts the app store login, but it did. I had tried everything else mentioned

Hi Gus,

Had same problem on my Mac.

Here is what fixed my problem:

1. Changed to another country (I am in Israel, and I changed to the USA store).

2. Clicked "Get" on the app I wanted.

3. Got a message stating that my Apple ID cannot be used in the USA store, and that I would be redirected to my store.

4. After I got redirected, searched for the app again, and clicked "Get".

5. App installed fine. Later apps (I tried before and failed) are now installing fine!

Hope this helps!

POSSIBLE SOLUTIONS:

I got the "Cannot connect to App Store" message and absolutely NOTHING worked. I couldn't sign out and in again or even create a new account. I had this happen a few years ago with whichever OS came before Mavericks (I can't remember), but it just happened to me again recently with El Capitan on my 2012 MacBook Pro. If none of the other solutions here have worked for you (i.e., getting rid of the .plist files, changing ethernet settings, etc.), I can offer these suggestions to fix it or at least get it working long enough for you to make your updates and purchases:

1) Back up your computer and reinstall your operating system from the emergency partition.

2) Back up your computer and reinstall your system from a Time Machine backup and reapply your updates. Or,

3) Restart the computer in Safe Mode (Shift-Restart) and run the App Store.

This one should work because it runs your computer from bare bones, with no extra goodies or utilities running in the background. It's configured the way it was when you bought the computer brand new, so the App Store should run like it did right out of the box. If you can't get the App Store to run any other way, Safe Mode almost always works, which should allow you to at the very least run it temporarily to install your updates and make purchases.

There are several steps:

• Open the App Store, go to the Store menu and sign out

• Restart the computer but hold down the Shift key until the Apple symbol comes up and computer starts booting. It may take a little longer to start up.

• Open the App Store. You should still see the "Cannot connect to App Store" error message.

• Go to the Store menu and select "Sign In". This time, instead of an error message, it should offer you the normal sign in dialog box

• Enter your Apple ID username and password

• It might take a few seconds, but your "Featured", "Categories", "Purchased" and "Updates" buttons should now be selectable, not greyed out.

• Click on whichever ones you want and do what you need to do (browse categories, update, make purchases, etc.).

• When you're done, restart the computer in normal mode (i.e., no Shift key)

• Start the App Store again. It should work just fine from now on. But if it doesn't, at least you now have a functioning workaround.

And by the way, NO THANKS TO APPLE FOR HELPING ME FIND THIS FIX!!! If it were possible, I'd sue you to get back all the hours of my life I wasted working this problem. If you're going to force us to use the App Store as our only means to update and make purchases, there's no excuse for allowing this kind of error to go unfixed, especially for this long. I have to say that this is pathetic. You're basically forcing your users to provide their own tech support. I have yet to come here and see an actual solution to this problem offered by Apple tech support. As far as I can see, these forums are where legitimate tech support questions come to die. There are too many people here having the same problem. If you can't give us an App Store that actually works and your tech support people can't solve the problem because of your buggy programming, at the very least, give us an alternative that can keep us working. How about a page where we can enter our Apple ID and password and get links to the OS and all of our purchased applications from the Apple site or from iCloud. Or maybe you could just fix your crappy App Store. This is just disgraceful.

same problem here. I already explained the problem in another thread:

https://discussions.apple.com/thread/4259595

email discussion with apple support did not help...

hope the problem will be fixed automatically with 10.8.2. as a temporary and inconvenient solution one can use a second user account on the same mac to update or install apps.

I had this problem too, until today. I noticed that not only was I having trouble updating applications, facebook wouldn't load certain pictures and sometimes webpages wouldn't open because "safari couldn't find the server." Anyway, for me not being able to load the webpages was the most annoying since the ones that wouldn't load revolved around college. So, I googled the problem. Turns out, I needed to update my DNS. Here is what I did:

Click On:

System preferences > Network > Advanced

At the top, there is a tab for DNS.

I added 208.67.222.222 and 208.67.220.220

On top of this I also deleted my cookies. To do that, open safari.

Safari > Preferences

At the top there is a tab for Privacy.

Remove All Website Data...

Anyway, I'm pretty sure it was the DNS change that fixed it, but it doesn't hurt to delete your cookies every once in awhile 🙂

Let me know if that helps

I try mohd hatta's suggestion below and it works for me now. 🙂

"navigate to Library/Preferences/SystemConfiguration and then delete NetworkInterfaces.plist

then restart ur mac, setting ur network and sign in app store"

Xie Xie to mohd hatta ~~ (Thanks in Mandarin [Chinese] to mohd hatta) James Liang from Taiwan

I had the same problem, couldn't sign into the app store - login worked for iTunes though: I went to Library/Preferences/SystemConfiguration and then deleted 'NetworkInterfaces.plist', restarted my computer and voila, I could sign in to the app store on my account.

Thank you Mohd Hatta for this!

I don't know if anyone else posted this but after being on the phone with Apple support and going through a number of things already listed on this thread, this finally worked. Navigate to the "Go" menu in the Finder and hold down "option" key to bring up the hidden "Library". Go the cookies folder and delete the com.apple.appstore.plist file. Empty the trash. Try to login in to the Mac App Store. That worked for me.

Quit the Mac App Store.

Launch the program called "Activity Monitor". You'll find it in:

Macintosh HD/Applications/Utilities

A quick way to find it is to click the "Go" menu in the Finder and choose "Utilities" - it's in that folder.

Once it's launched, look for a process called "storeagent". Click once on it to highlight it, then click the red "Quit Process" button at the top left of Activity Monitor's toolbar. When you're then asked "Are you sure you want to quit this process?", click "Force Quit".

Launch the Mac App Store again (a new "storeagent" process will be created). You should now be able to log in to the Mac App Store. This fix has worked for me and others.

Deleting /Library/Preferences/SystemConfiguration/NetworkInterfaces.plist solved the "Unknown Error Occured" for me as well. I noticed that I also had a second network interface adapter configured for Eth2, not sure why, maybe VMWare did that. Anyways, I'm currently signed back into the App Store, iMessage, FaceTime & iCloud.

Simple Solution:

While in App Store, go to "Store" at the menu bar. Click "Sign out". Sign in as your account then downloads should work. I had this same problem and found this solution. Hopefully this helps!

I tried every solution on I could find on this thread and via google... what finally worked for me was heading to the top toolbar, clicking "Store" and then clicking "Sign Out". Then I successfully signed back in!!

Try this: go to Settings and choose "iTunes & App Store." Click on your Apple ID and choose "Sign Out." Then sign back in.

Worked perfectly for me. Thanks

navigate to Library/Preferences/SystemConfiguration and then delete NetworkInterfaces.plist

then restart ur mac, setting ur network and sign in app store"

My app store had that problem as well, "Unknown Error" kept coming up. I actually went to 'Store' and signed out of the previous account, and voila, it worked!!! Hopefully that works for anyone else?