What does "Network interrupted; server closed" mean? My phone (a Samsung Galaxy S4 Mini running Android 4.4.2) sometimes shows a message window with the text "Network interrupted; server closed". Does anybody know exactly what that means? I've tried googling it, but that doesn't get me anywhere.

The message is in English, even though I've set the phone to Dutch; other messages are in Dutch rather than English.

As far as I can see it happens when I get out of wifi range. I understand the "Network interrupted" part; seems normal if I go out of wifi range (though I'd rather expect something like "Connection lost"). What I don't understand is the "server closed" part. It seems to imply there is a server running on the phone -- does Android run some kind of server? Or is it possible that the message comes from some app that's running in the background rather than from Android itself?
If you have the "File Expert with Clouds" application installed then it may be the culprit. I was having the same issue and suspected it may be that application because it seemed to start happening after I had started and then stopped the FTP server.
I removed the application and the messages stopped.
I then re-installed the application and everything was fine until I started and stopped the FTP server at which time the messages started to appear again.
I removed the application (permanently this time) and the messages have stopped again.
I didn't bother to check to see if I could connect to the FTP server when it was supposedly stopped but I may re-install the app one more time just to see if that's the case. I'll post the result here if I do get around to testing it... Paul