I am trying using Music Manager behind a proxy but it could't connect. Is it possible to configure and use Google Music Manager on Windows 7/8 behind a proxy?
As of March 2014, a better solution is to enable 'Google Play Music' for Chrome:
Once done you can add music via the newly enabled browser mini-player. Goto 'My Library' and click 'Add Music'.
This completely eliminates the desktop music manager requirement. You can upload your entire music library without messing with proxifiers. Hope this helps!
Yes. For applications that don't support a proxy configuration out of the box, you need a proxifier.
There are different proxifier implementations available, but one of the most popular is called Proxifier -- but do not confuse the application "Proxifier" as being the only one available, because it is not.
The essence of what a proxifier app does is, it intercepts the networking stack API calls at some level by inserting a DLL hook, whose symbols take higher precedence than the network stack. And it basically imposes the HTTP proxy by modifying the data stream before sending it to the underlying networking stack.
There may be easier ways to do this if Google Music Manager supports proxies, but I am not aware that it does.