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Someone on another thread posted it. Fixed my issue but now it shows that there are no further updates when I know there are (ex: iTunes 12.1, etc.).
 
Someone on another thread posted it. Fixed my issue but now it shows that there are no further updates when I know there are (ex: iTunes 12.1, etc.).

Thanks for clarifying that. Still, it'd be great to see that thread, if you don't mind providing the link, that is. It might prove helpful for future users experiencing the same issue.
 
Are you able to test to see if other updates are showing for you, or have you already installed other updates?
 
Are you able to test to see if other updates are showing for you, or have you already installed other updates?

I have three other available updates. However, they are not system updates, but rather Pages, Numbers and Keynote (I can't be bothered updating them until they are further improved – but I digress).

After running "your" command, I used terminal to install the recommended system updates. Hence, they do not show up in the list of recently installed updates in App Store. I have confirmed that they are in fact installed.
 
Yep my experience exactly. Folks at the local Apple store wanted me to bring in all my Macs (devices, they called them) saying they needed to see what the fault was on my Macs. They don't even think to recognise a fault with the Apple Server. The do not read these posts and appear to have no awareness of the problem. I explained the whole thing but it was liking nailing jelly to a tree. Hopeless. I just gave up and resorted to manual downloads of all Apple applications.
 
Just wanted to add my voice to this: mac Mini, late 2012, Sierra 10.12.1, and have had a similar problem where the Mac App Store would show a variety of problems including not connecting to the store, taking forever to scan for updates, or just returning instantly with "No updates available". This started approximately when I upgraded to Sierra, but I can't be certain of that.

The solution was to remove the directory /private/var/folders/zz/zyxvpxvq6csfxvn_n00000s0000068 and restart the Mac App Store. It rebuilt the directory and I have had no problems since (for a week, at least).
 
Try this:
In terminal, either copy and paste the following, or type it in. (the last character is a lower case L.)
Code:
sudo softwareupdate -l
Enter your admin account password when prompted. This runs the command line Software Update app (which is what the App Store application is actually doing) and should provide a little more detail. The lower case L only lists the updates available. If you want to go ahead and install all the updates that it finds, you'd enter:
Code:
sudo softwareupdate -ia
again entering your password if prompted, and restarting the computer when prompted.
You may also want to enter this:
Code:
defaults read /Library/Preferences/com.apple.SoftwareUpdate CatalogURL
This error sounds as if your computer may not be looking at the default Software Update Server, and this last command will report which server it's set to use.
[doublepost=1488225291][/doublepost]I entered the three commands. The first 2 gave the same error: "Can't load data from the software update server". On the third command, I got this output:
https://swscan.apple.com/content/ca...ion-snowleopard-leopard.merged-1.sucatalog.gz

As I am running Sierra, I am pretty certain this isn't the right server! It's for Lion, Leopard, and their offspring, not for Sierra. So, how do I tell the App Store or softwareupdate to use the Sierra server?
 
[doublepost=1488225291][/doublepost]I entered the three commands. The first 2 gave the same error: "Can't load data from the software update server". On the third command, I got this output:
https://swscan.apple.com/content/ca...ion-snowleopard-leopard.merged-1.sucatalog.gz

As I am running Sierra, I am pretty certain this isn't the right server! It's for Lion, Leopard, and their offspring, not for Sierra. So, how do I tell the App Store or softwareupdate to use the Sierra server?
That's the beta software update catalog, which tells me that you're most likely not running a released version of Sierra. If you look at "about this Mac" from the Apple menu, click on the text that says Version 10.12 (or whatever yours says exactly) and you'll see a build number appear in parentheses. For instance on my computer it shows Version 10.12.3, and if I click on the Version 10.12.3 text, I then see Version 10.12.3 (16D32). What do you see on your computer?
 
As I am running Sierra, I am pretty certain this isn't the right server! It's for Lion, Leopard, and their offspring, not for Sierra. So, how do I tell the App Store or softwareupdate to use the Sierra server?
Seeing as you're running "Sierra" and this is the "Yosemite" forum, maybe if you posted your problem in the correct forum you'd stand a better chance of finding a solution.
 
That's the beta software update catalog, which tells me that you're most likely not running a released version of Sierra. If you look at "about this Mac" from the Apple menu, click on the text that says Version 10.12 (or whatever yours says exactly) and you'll see a build number appear in parentheses. For instance on my computer it shows Version 10.12.3, and if I click on the Version 10.12.3 text, I then see Version 10.12.3 (16D32). What do you see on your computer?
I have 16D32 also. Having the beta catalog makes some sense, actually. I was in the public beta program and inadvertantly allowed 10.12.4 Beta 1 to install. I wanted to quit the program to avoid frequent updates; had important work to get done. So, I quit, and then back-installed 10.12.3. The problem that arose is that Mail and Photos databases had been modified by the beta, and will not open in 10.12.3! So, I attempted to re-join the beta (after a few weeks), figuring the betas are probably quite stable now. However, after installing, no beta update shows up in the App Store.

Perhaps I need to re-install 10.12.3 using the combo installer?
 
I have 16D32 also. Having the beta catalog makes some sense, actually. I was in the public beta program and inadvertantly allowed 10.12.4 Beta 1 to install. I wanted to quit the program to avoid frequent updates; had important work to get done. So, I quit, and then back-installed 10.12.3. The problem that arose is that Mail and Photos databases had been modified by the beta, and will not open in 10.12.3! So, I attempted to re-join the beta (after a few weeks), figuring the betas are probably quite stable now. However, after installing, no beta update shows up in the App Store.

Perhaps I need to re-install 10.12.3 using the combo installer?

I applied the combo updater. My App Store updates have resumed (I had nothing after 2/24). But no MacOS beta in the list! I wonder if I have to wait for the NEXT update? Why can't I get the current one? (Checked App Store prefs and they are set to receive beta updates).
 
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