Q: iTunes Match on Mountain Lion doesn't work on my 2012 MacBook Pro. I had Lion before, and iTunes Match worked fine. Now it disconnects and back every few seconds. I tried resetting cache, iTunes, turning on/off match, but nothing works. Now what?

i think it's likely that it works fine at schools/businesses because they usually have symmetrical pipes, that is, their upload speed is roughly equal to their download speed - 10s or 100s of megabits up instead of 1 or 2. it's also possible that in school/work enviromments that the networks are designed so that no one client or subnetwork can overwhelm the uplink to the internet, that is, traffic shaping is already being used.

i think with home connections the fact that it's reasonably easy to saturate the uplink is the problem behind the bug here. saving some extra bandwidth so that the upload does not swamp the TCP/IP control traffic is what keeps things humming along.

Hi robert pfile!

I think you could be on to something here.  I know that at my school upload speed is actually a little greater than download.  But you are right they are more or less the same and well into the 20+ MB/s both ways.  My upload speed at home is around 0.9 -1.0 MB/s on a pretty consistent basis with download speeds around 20 - 25 MB/s.

Although nothing is for certain, I think your insight holds enough merit to add it as an addition to my previous feedback report.  Do I have your permission to use it?

Mr. Luigi

sure, but apple engineers will probably dismiss it as yet another "smug report"

I as well have no problem uploading songs while connected to my schools wifi, but for some reason when I get home and try to match some new music, it matches what it can and then proceeds to fail when it gets to the uploading step. To say the least, it is quite infuriating. I have had to resort to bringing my computer to school every time I get new music that is not on the iTunes Store.

If it helps, my home wifi is a 2WIRE setup from AT&T:

Connection-specific DNS Suffix: gateway.2wire.net

Description: Broadcom 802.11n Network Adapter

Connection Speed:

     incoming: 3008kbps

     outgoing: 512kbps

I'm not sure exactly what my school setup is, but I do know that it is significantly faster than my home connection (which is very very slow).

OSX 10.8.3 just came out today.  Has anybody downloaded it and noticed any changes in performance with regard to our problem?  I checked the list of "addressed issues."  ITM was not mentioned so I doubt anything improved.  But, since several posters have noted a connection between this issue and Mt. Lion I thought I'd give it a mention.

Check out the thread https://discussions.apple.com/thread/4885422?tstart=0 which shows a simple update to 10.8.3 may fix the problem... it did for me! 

Hope that helps.

OS X 10.8.3 did not solve my problem.

That stinks that the update didn't fix it for you.  Have you checked see in the "View" menu drop down if you have it show or hide Music in the Cloud?

This is a far fetched idea, but what the heck.

Sometimes, earlier versions of an OS will develop corruptions and if you do a delta update (which is what you will get if you are running OS X 10.8.2 and use Software Update to go to the newly released OS X 10.8.3) those corruptions will remain.

Maybe those of us in this forum developed some bug/corruption along the way from OS 10.8.0 to 10.8.2.  The result...this download problem.

The odds of this happening are sooooo miniscule.  But, it wouldn't hurt at all to do a OS X 10.8.3 COMBO update and, who knows, refreshing OS X 10.8.X from its beginning might get rid of something nasty that snuck into the OS.

It's worth a try.  The only price to pay is the update will take a little longer.

Here is the link to the combo update on the Apple site. 

http://support.apple.com/kb/DL1640?viewlocale=en_US&locale=en_US

I just did the combo update, but don't have any music to test it on.  When I do, I'll report back.  I'd love to have someone else try it out and see if it has any affect on this uploading music to the Cloud problem.

And once again, I know, this probably won't do jack s^^^.  Heck, some people do combo updates as a matter of update policy.  It can't hurt, and it might help.

Best, Mr. Luigi.

Not a single comment for a week.  Has our problem been solved?

I have had no significant issues (just things like some missing artwork, etc.).  But, I have not subjected ITM to a substantial "torture test."

same problem , herer, my whole library uploaded fine in the past. But i recently cleared out the cloud music , so i could do some maintenance on itunes, change artwork ,etc. , know it will only uploaded up 5% of my library.

Ok everyone, I had been having the same problems as everyone else and after reading all 11 pages of this discussion and trying every possible solution I have been able to get past this.  I have an iMac, Charter cable modem (30Mbps down and 4 Mbps up) and an Airport Extreme. I determined that my problem, like others, was isolated to my home network(not songs).  Found this out by setting my iPad (with Verizon Data Plan) up as a personal Hot Spot and connecting the iMac to it wirelessly.  Suddenly all songs in "Waiting" status began to upload, at least until my data plan was exhausted (About 250 songs), so I knew this was a networking problem. I in no way profess to be any kind of a network guru but I researched everything possible anyway. Apple routers do not offer QoS settings.  However, Apple has a piece of software for download that developers use for testing called "Network Line Conditioner".  Can't remember where I found it off hand, but figured it was a safe product to try since it was an Apple product and not some third party software. Initially I had no luck modifing the direct LAN connection to the router so I disconnected the LAN cable from the iMac. I then turned on the Mac's Wi-Fi and connected to my home network. After trying several of the pre-set options in the program, I was able to find one that worked and I slowed down my Upload speed and made a 1% allowance for dropped packets (My custom setting, I'm not sure I even know what dropped packets are).  Don't know what this fixed or what the problem really was but my songs in "Waiting" now upload without problems or failures or restarting.  The (GUI) program is very easy to use and simple to turn "On" and "Off".  When "On" it resides up top near the "Signal Strength" indicator and is selectable with a "Right Click".  I can't promise that this will work for any or all but I wanted to share my success.  Maybe others can elaborate on my lack of "Network Knowledge" and explain this a little better. Good luck to all!

This has been going on for well more than a year. ITunes Match works on every Windows PC I've tried it on but NOT on my Mac. I've tried very proposed solution that I've found on this and every other forum and website I've found. I spent more than eight hours on the phone with Apple Tech Support over a span of more than a month.

A senior Apple Tech Support representative told me that he read through this forum at my request and that anything that has appeared to have worked was mere coincidence. Apple is aware of the problem and either cannot or will not fix it. My iTunes Match subscription will expire at the end of March. I have turned of auto-renew. I'm done with it.

OK, maybe Apple has fixed this problem and that is why no one has posted for a while.  Or, maybe everyone has given up.  I thought I would post some recent information in case the problem still exists.  Maybe it contains a hint that may point toward a solution.

My home network it EXACTLY the same.  Same provider.  Same level of service.  Same Apple Time Capsule.  No settings have been changed.

I had been using a 15 inch MacBook Pro.  Running OS X 10.8.3.  2.53 GHz Intel Core 2 Duo, 4GB RAM 1067 Mhz DDR3.

I now am using a new Mac Mini.  i7 Quad Core Processor.  I upgraded the stock 4GB of RAM to 16GB of RAM from Crucial.

I finally got to setting up iTunes on my new Mini and had to download my entire iTunes library from the Cloud to my MIni.  Many of those songs were not matched.  No problems.  Everything was transferred onto my MIni smooth as silk.  Then I uploaded about 4 songs to the Cloud from a CD that couldn't be matched.  No problems.

Yes, I know.  This totally seems to go against the network theory since as far as I can tell I didn't do anything with the network settings.  Hm...

Like I said, maybe this problem has been fixed by Apple and that is why I had no problems.  Maybe it had nothing to do with the new Mini, its 16GB of RAM, i7 quad core processor, etc.

I am having the same issue.

I setup my old MacBook Pro, which is running Snow Leopard, with my iTunes libraray and it works ok.  Same network conditions, same network infrastructure, same iTunes Library etc.

When I try with my latest iMac (running Mountain Lion) iTunes Match fails at various points in the process, but never completes.

However, if I tether my iMac to my iPhone, the iTunes Match process works.  I have tried both Ethernet and Wi-fi connections and both fail.

The problem is definitely with Mountain Lion (as it worked ok on my 2009 iMac until I upgraded to ML) and, possibly, wi-fi/ethernet network connections and is consistant.  I even stup my old 2009 iMac with 3 boot partitions (Snow Leopard, Lion, Mountain Lion) each with the same copy of my iTunes Library but whenever I booted into Mountain lion, iTunes Match failed.  Same computer running different OS X, on same network with same library works ok.

I know that Apple haven't fixed the problem despite 3 upgrades to OS X 10.8 and 4 upgrades to iTunes 11.  I've even noticed a change to the iTunes Match service itself which still hasn't improved the reliability.

I wish Apple would read these blogs and/or take some of this information as feedback.  I can't believe that this problem isn't bigger than it appears.  Maybe they're just giving refunds (begrudgingly), to make people go away.