iTunes could not connect to this iPhone because an unknown error occurred (0xE80007F)

i myself was having the same issue, until i DEselected for itunes to backup my iphone 4 as an encrypted sync during a wireless backup, hope this helps you as well

I hope I do not sound like a big time noob but how did you "DEselected for itunes to backup my iphone 4 as an encrypted sync during a wireless backup"?

I am getting the same error and I am fairly new to Apple/iTunes.

I found how to "select or deselect but I am still getting this message. I am not sure why or how to tell if t is syncing properly

I've been getting the same message as well. I read one thing where it stated that having a hyphen in the iPhone name or computer name causes the issue, but I fixed that and I still am receiving this error.

I am using Windows 7 with iTunes 10.5 and have an iPhone4 with iOS v5.

Another thing that I find interesting is that I get this error when I don't even have my phone charging. As far as I've read, the Wifi sync is supposed to occur if the phone is off and the is charging. Why would it be trying to do the Wifi sync if I my phone is not hooked to a power source?

- Merg

Try connecting it to your computer by cable. Then uncheck mark "sync with this phone over wi fi" in itunes. Do a full sync. Do a full sync again just to be sure you got everything. Then check mark "sync with this phone over wi fi" and do a sync again. This cleared it up for me.

I have this same problem too.

Config:

WIN7 (32-bit)

iPhone 4

iOS 5

Notes on other suggestions:

• I backup to iCloud, and don't encrypt my backup.
• I don't have a hyphen in my computer name or in my iPhone name, but I do have an apostrophe in my iPhone name, but as that is the default that shouldn't matter

Other notes:

• Happens once, or multiple times a day at random times
• Happens when my iPhone isn't connected to a power cord, which I think is the only time it tries to do a backup anyway

Really annoying....

Ignore my previous post. Didn't work. Error came back. I gave up on iPhone 4 wifi sync. That stops it.

I have this problem. I also don't encrypt backups, have hyphens, etc. Even if I did, this is a bug Apple should fix. Does Apple monitor these forums?

Yes unchecking "sync with this iPhone over Wi-Fi" fixes it, but that's a new feature I'd like to use.

Apple w-t-f?

I have this same problem.

- iPhone 4s with wi-fi sync enabled

- no local encrypted backup configured

- windows 7

While iTunes is open it will regularly pop-up this message, especially when the iPhone enters or leaves the wi-fi network.

None of the suggested solutions posted in this thread have worked, but I know that disabling wi-fi sync is going to be a work-around.

I had this same error. What I found is that if you have a passcode on your phone you will get this error. Simply unlock your phone and it should then connect and sync, at least this worked for me.

Nice find! I will try that. But my phone auto locks so this'll be a recurring problem.

Others, please don't say that disabling wi-fi sync is a "work around". It means you can't sync over wi-fi. It's broken. You bought the phone with a promise you could sync via wi-fi.

I agree that disabling wifi sync it's not a workaround for getting wifi sync to work. It's only a workaround to prevent iTunes from popping up errors to the foreground every time the iPhone enters or leaves the house or attempts to sync.

I have had this same issue with my iPhone 4 since iOS 5 was released. None of the updates has fixed it yet. I'm using Windows 7 Pro (64 bit), and iTunes 10.5.3 I am not encrypting my backups. I do have my phone set to passcode lock after 1 hour. When I have enabled WiFi sync in iTunes, I get the error message described in this thread at least once every day. In the morning, when I first open iTunes, I will have to click this window sometimes 8 to 10 times to get it to finally dismiss and begin the sync process.

It's apparent that iTunes is hung up whenever this message is present. It's not downloading podcasts during the night, or performing the WiFi sync while my phone is charging in the other room. Nothing works until I sit in front of iTunes and click off the error message. If I am required to do that in order to get the phone to update, I should just plug it in and disable the WiFi sync hassles until/if it ever gets fixed.

Hey All,

I too am one of the people who has been really annoyed by this, but I finally just gave up. I mean with iCloud, what is the point in syncing with iTunes anyway? Guessing the rest of you, like me only sync for podcasts? Anyway, if you are like me, and you only sync for Podcasts, it is totally worth checking out iCatcher in the app store. I am not affiliated with them in any way. They allow you to sync your podcasts by just launching the app on your iPhone.

It seems rediculous that you even have to sync your podcasts using iTunes, it seems like the Music app should just sync them automatically.

I personally wish Apple would just put iTunes out of its misery, I am sick of the constant crashing, the cryptic error messages, convoluted and impossible to understand syncing process, and the horribly slow iTunes store.

So anyway, if you are only syncing for Podcasts, skip it and just get one of the apps that handles that process itself.

-Dave