Hi Freddy,

I see that you already reported an issue for this, so I will close your question here. But to answer your question: this is a Windows GUI issue, for which a workaround is available. We communicated it here: 

Fun fact: We do not use Windows GUI ( I mean this is probably also a system flow), we get these errors from the Indicium tier (container). 

Edit: What I think might happend is that for some reason I have to re-authenticate. I mean in all development environments the SF asks again for permission. So I'm guessing that as I was able to download a solution these system flow errors will disappear. I'll monitor first.

Can't you add a validation and inform that the authorizations given has been expired or non-existent instead of this error? I mean, this scenario was the last to pop my mind when seeing connection refused. 

​@Jeroen van den Belt there is something else. I went to the store in the SF. Authenticated, downloaded a solution..   recycled indicium and still I get. 

fail: SystemFlowSchedulinge0]

      Process action "oauth_server_login_connector_thinkstore_listing" in process flow "system_flow_thinkstore_refresh" in application 1008 threw an exception.

      System.Net.Http.HttpRequestException: Connection refused (store.thinkwisesoftware.com:443)

       ---> System.Net.Sockets.SocketException (111): Connection refused