Ehrm. None... I suspect that it is the firewall/proxy in your company that requests a password... Or a plugin you installed which requires registration...
Please find attached password required screen which i am getting. seems it is related to Security Storage Preferences Setting. But i am not sure about it.
i checked by changing password for Security Storage Preference & using it. Also used windows login userid/password. but no luck.
I can create and run application using STS on tc server without any problem.
I have no idea, it isn't related to STS that is for sure because that doesn't need any password. So as I said it is something you either installed or some security setting on your firewall proxy (although that doesn't seem to be the case judging from the screen print).