Same problem as was reported here
2016-05-19 10:06:46,345 UpmAsynchronousTaskManager:thread-3 ERROR xxxxxxx 606x139x3 9mf5mg 192.168.225.63,127.0.0.1 /rest/plugins/1.0/ [rest.resources.install.InstallFromUriTask] Error downloading plugin from https://marketplace.atlassian.com/download/plugins/com.atlassian.upm.atlassian-universal-plugin-manager-plugin/version/138751
I havee no problem accessing the marketplace and download it using wget locally on the system, but they won't load that way either.
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