A better readable list of plugins.
Code Macro Plugin Installed version: 2.0.19 Available version: 2.1.1 Confluence Business Blueprints Bundle Installed version: 1.7.1 Available version: 1.7.4 Confluence Contributors Plugin Installed version: 1.3.1 Available version: 1.3.2 Layout Macros Installed version: 2.1.2 Available version: 2.1.4 Live Search Macros nstalled version: 3.0.1 Available version: 3.0.3 Page Tree Plugin Installed version: 2.1.5 Available version: 2.2.1 Share Page Installed version: 2.0.9 Available version: 18.104.22.168 Widget Connector Installed version: 2.1.1 Available version: 2.1.6
As I already indicated in my question, there is nothing interesting in the log. Actually, when I "tail -f" the log file (and for good measure, also the log files in <confluence-install>), nothing is logged when I press the update button.
I just checked whether it made any difference if I used another browser (inspired by the fact that the answers.atlassian.com does not function properly using Chrome), but also with IE it does not want to update the plugin, nor does it generate any additional logs.
You should be able to see some information from atlassian.confluence.log. Please ensure that you have tail the correct log which is atlassian.confluence.log(application log) and not the catalina log (server log).
Try to tail atlassian.confluence.log then reproduce the issue. If possible, please attach the stacktrace to this page so I can investigate for you two.
Here follows a tail (last 30 lines) of my atlassian-confluence.log. There are a bunch of warnings but nothing that links to the problem at hand. I just tried updating the plugins again at around 18:00 and nothing with this timestamp in the log file shows up. Last log entry is from around 06:20. As you can see from the log I have recently restarted Confluence. There is one warning about the universal-plugin manager, might this be related?
I also uploaded the UPM (and just to test, restarted Confluence) but it didn't help. The system plugins ARE upgradable though, just not by clicking the Update button. I just tried to upload the Confluence Business Blueprints Bundle version 1.7.4 from the marketplace and it installed without any problems. Downside is now it shows up as a user-installed plugin instead of a system-plugin. Dosen't really matter though. So I'm guessing there is nothing wrong with Confluence UPM or the whole updating system, it must be the interface. Which would make sense, since when clicking the Update button on a system plugin the error message shows up instantly. It doesn't even try to download the plugin.
So this is at least a workaround to update system plugins.
I've just been running a packet capture on the firewall to see if any packets are trying to get through. Started the packet capture, hit Update on a system plugin in Confluence and recieved the usual error message, checked to packet capture and nothing. Confluence arn't even trying to contact Atlassians servers or anything. The packet capture was indeed empty (but working, I checked the traffic while browsing the Marketplace, and that traffic showed up). But I don't think the problem is the UPM, since user-installed plugins updates just fine.
Experiencing a similar issue trying to update the Confluence Business Blueprints Bundle when using Confluence Version: 5.1.3, Confluence Business Blueprints Bundle Version: 1.7-m1.
Attempting to update to Confluence Business Blueprints Bundle Version: 1.7.4 fails with a message "An error was encountered while updating this add-on".
If you look at something like Chrome developer tools when the initial Manage Add-ons page loads or occasionally? when you click the 'Update' button a call into confluence REST API on our system is returning a 404, presumably this leaves the page in a state it can no longer update the plugin with the usual process.
For example in our system the URL returning the 404 is:
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