Some Mac App Store Apps 'Damaged' Due to Expired Security Certificate

A growing number of MacRumors readers and Twitter users have been experiencing an issue with some Mac App Store apps displaying a "damaged" error when opened since late Wednesday. The issue has affected popular apps such as 1Password, Acorn, Byword, DaisyDisk and Tweetbot.

Damaged-Mac-App-Store-Apps

Mac App Store apps with a "damaged" error (Image: Graham/Twitter)

Mac users are prompted with this error message when opening Mac App Store apps:

“App Name” is damaged and can’t be opened. Delete “App Name” and download it again from the App Store.

Tweetbot developer Paul Haddad tweeted that the issue appears to be related to security certificates that expired on November 11, 2015, and he further speculated that the receipts now using SHA256 encryption may be causing problems with older OS X versions.

The issue, however, also appears to affect some users running OS X El Capitan, leading Haddad to believe that Mac App Store apps contacting Apple's servers simultaneously may be causing a "self inflicted DDOS on Apple’s receipt generation service."

Haddad says that rebooting your Mac on OS X 10.10 or later may resolve the issue, while some users have been forced to reinstall apps from the Mac App Store, disconnect from and reopen the Mac App Store or simply reenter their Apple ID password.

It appears that Apple has since set a new 2035 expiration date for the security certificates, per The Guardian, at least some for apps, but the issues are persisting for some. Apple did not respond to request for comment.

Update: Rene Ritchie at iMore has further explained what's causing Mac apps to report as "damaged" and what can be done about it.

Top Rated Comments

Razeus Avatar
69 months ago
Welcome to Tim Cook's Apple...

It Just Works is a thing of the past.
Score: 11 Votes (Like | Disagree)
pianojoe Avatar
69 months ago
Now, this is embarrassing.
Score: 8 Votes (Like | Disagree)
lysingur Avatar
69 months ago
I'm actually kind of glad that Apple isn't planning on making any cars. Oh, wait...
Score: 7 Votes (Like | Disagree)
Tiger8 Avatar
69 months ago
I said it before and I say it again, Apple is falling behind in the software department. The number of bugs seems to increase with every release for either OSX or iOS. They still haven't resolved the iCloud backup issue, they should be embarrassed.
Score: 7 Votes (Like | Disagree)
canesalato Avatar
69 months ago
And Scott Forstall was kicked out because he didn't apologize for Maps?
Score: 6 Votes (Like | Disagree)
konqerror Avatar
69 months ago
This is yet another Apple services fail. What happens if you're outside of Internet access, say you're going to give a presentation?

The cert is valid for 5 years, so they should make the system automatically refresh when the cert has a year or even 6 months left to go.

Even Microsoft's DRM is better than Apple's. For time-limited (corporate) activation, it starts trying to contact the activation server after a month, but will let you go 6 months without locking you out.
Score: 6 Votes (Like | Disagree)

Top Stories

apple transfer google photos 1

Apple Launches Service for Transferring iCloud Photos and Videos to Google Photos

Wednesday March 3, 2021 12:04 pm PST by
Apple this week introduced a new service that's designed to make it quick and easy for iCloud users to transfer their stored photos and videos to Google Photos. As outlined in an Apple support document, you can go to Apple's privacy website and sign in to see the "Transfer a copy of your data" option. If you select this and go through all the steps, Apple will transfer your iCloud photos and ...
PIA23764 RoverNamePlateonMars web

NASA Mars Perseverance Rover Uses Same PowerPC Chipset Found in 1998 G3 iMac

Tuesday March 2, 2021 3:21 am PST by
NASA's Perseverance rover, which recently made history landing on the surface of Mars, is powered by the same processor used in an iMac more than 23 years old. Image Credit: NASA As reported by NewScientist (via Gizmodo), the rover includes the PowerPC 750 processor, the same chip used in the G3 iMac in 1998. The main chipset is the same; however, there are differences between the...
rosetta 2

Rosetta May Be Removed From M1 Macs in Some Regions on macOS 11.3

Tuesday March 2, 2021 5:20 pm PST by
Installing the upcoming macOS 11.3 software update on an M1 Mac may result in Rosetta 2 being removed in one or more regions around the world. In the third beta of macOS 11.3 seeded to developers for testing today, MacRumors contributor Steve Moser uncovered new strings in the beta's code indicating that "Rosetta will be removed upon installing this update." Another new string reads "Rosetta ...
iphone 6 in hand

Apple Faces Another iPhone Lawsuit Over 'Programmed Obsolescence'

Monday March 1, 2021 6:44 am PST by
Apple faces a new class-action lawsuit that accuses it of deliberately releasing iOS updates that slowly reduce the performance of an iPhone, forcing customers to upgrade their devices. The lawsuit comes from the Portuguese Consumer Protection Agency, Deco Proteste (via Marketeer), which in a statement says that it will proceed with a case against the Cupertino tech giant because it...
magsafe charging brick feature

Prosser: iPhone 12 MagSafe Battery Pack to Feature Reverse Charging

Monday March 1, 2021 1:18 pm PST by
Apple is working on MagSafe-compatible battery packs that will be compatible with the iPhone 12 models, and leaker Jon Prosser today said on the Genius Bar podcast that one version of the battery pack will feature "reverse charging." According to Prosser, Apple is working on two versions of the battery packs, one that's a standard version and one that's a premium version with reverse...
Screen Shot 2021 03 03 at 11

MagSafe Charging Port for iPhone Appears in Apple Patent

Wednesday March 3, 2021 1:30 am PST by
In a newly granted patent, Apple envisions a type of connectivity port using an iteration of its magnetic MagSafe charger to charge an iPhone, potentially paving the way for a future without Lightning. Submitted to the United States Patent and Trademark Office on Tuesday (via Patently Apple), the patent outlines a three-pinned MagSafe charger, similar to the ones found in older MacBook...
Apple Prefer Lightning Over USB C Feature

iPhone Sticking With Lightning Port Over USB-C for 'Foreseeable Future'

Tuesday March 2, 2021 9:32 am PST by
Apple will retain the Lightning connector on the iPhone for the "foreseeable future," with no intention of switching to USB-C, according to reliable analyst Ming-Chi Kuo. In spite of much of the industry moving toward USB-C, Apple will not be using it to replace the Lightning connector on the iPhone 13, or indeed on any iPhone model for the time being. In a note seen by MacRumors yesterday,...
iPad mini pro feature

Sketchy Rumor Claims 'iPad Mini Pro' Launching in Second Half of 2021

Wednesday March 3, 2021 3:04 am PST by
Apple is expected to launch a sixth-generation iPad mini in the first half of 2021, possibly as soon as this March, based on long-standing rumors. However, a new rumor out of Asia that has gained traction in the last 24 hours suggests an "iPad mini Pro" will arrive in the second half of this year. According to a post on Korean blog Naver, whose rumor track record is unknown, the device...
apple pencil 3 leak

New Apple Pencil Allegedly Leaks With Glossy Finish and Redesigned Tip

Wednesday March 3, 2021 6:17 am PST by
Images supposedly depicting a third-generation Apple Pencil have been shared on Twitter by the leaker known as "Mr. White." The purported new Apple Pencil appears to share a very similar design to the current, second-generation Apple Pencil, which is shorter than the previous version and charges inductively on the side of an iPad. The updated Apple Pencil appears to have a glossy...
apple watch ecg wrist

Apple Watch ECG Feature Gets Approved in Australia

Wednesday March 3, 2021 2:07 am PST by
The Australian government has approved ECG functionality on the Apple Watch, giving Apple the all-clear to launch the feature for Apple Watch users in the country, according to a regulatory document first spotted by The 8-Bit. Earlier last month, the Apple Watch's irregular heart rhythm notification received approval in Australia, although ECG did not. Irregular heart rhythm is a feature...