App Store > Updates - Internal Server Error - Read

Please sign out of the App Store and sign back in. Test.

I am having this same problem on Yosemite (10.10). I've tried logging in and out - it doesn't seem to make a difference. I've also restarted my laptop several times. Any other advice?

Same issue but on OS X 10.9.5 (13F34)

Internal Server Error - Read

The server encountered an internal error or misconfiguration and was unable to complete your request.

Reference #3.cf48212e.1426104997.17ac57e

I tried the suggestion to sign out of the App Store and back in. Restarted as well.

This didn't help.

Fixed.

Tried again (update) and it works.

So is this something that just happens every now and then? I've rebooted three times this morning, and still I'm getting this error—

You know, it would be nice if they'd phrase this stuff so we mere mortals could grasp some meaning from it. That "Reference #" looks important, but what are we supposed to make of it? "... internal error or misconfiguration ... "—huh?

I don't need to know where this "internal server" sits, nor do I want to know the name of the techie who spilled his Starbucks latté into it. I just want to know what I need to do. Do I wait patiently and try again later? Reboot my machine until at last I get there? Go to the Community and ask questions? Visit the Genius Bar ... ?

For what it's worth, the App Store finally let me run the update about four hours after I posted my question. Go figure ... .

That error is typically what you would see when something is wrong server-side, although it depends on how the App Store app is implemented. So, it's just as likely that the problem is on Apple's side.

Another thing to try: I discovered that you can refresh the page just like a webpage by using ⌘-R, and that fixed it for me. (If it is implemented like a web page, that might overcome continuing to see the error due to page caching.)

If it still doesn't work, my suggestion is to wait it out and try again later, because it's probably Apple's update server (or a communication problem between you and them).

Yes, I think that's exactly what's going on here. Thanks.

I suspect that in my case it's Little Snitch holding my data usage in check (could be the same on your end, or a router blocking connections, etc.) and iTunes screaming bloody murder that it can't call Mommy Apple. Also, see Resolve issues between iTunes and third-party security software - Apple Support which may explain better what's going on with this error and how to resolve it. Alas, I don't find any way to resolve it by having iTunes STOP making Internet calls without my explicit permission. :-(

This still occurs