What credentials does Windows 7 use to access network shares by default?
The context: I have a Synology Diskstation in my network, that provides some network shares. These shares (and their sub-folders) are access restricted to user accounts on the Diskstation.
Expected behavior: I expected to be prompted for login credentials whenever I try to access those shares from a network computer.
Observed behavior: I can access any and all shares without login from any network computer?!! I can even inspect the security details of each share and see that the rights are set to the expected Diskstaion-users, but I can access them nevertheless?!
I have read somewhere that windows uses "guest" as default login, when accessing network shares. But I tried disabling the guest profile on the Diskstaion: no change. I do however have some network-drives connected to the Diskstation (with the appropriate login credentials). Could Windows "reuse" those credentials to login to other shares on the same device? That seems strange to me.
EDIT: All logins are local, i.e. not domain-logins. Also the computer and Diskstation accounts do not have the same usernames/passwords.