I can access it through a variety of Linuxes, just not the N810, and XP is shared without complaint
1: Disable SMB2 on the 7 box if you haven't already. It's buggy. And exploitable! 2: in the group policy editor (gpedit.msc) turn off the policy which enforces "Always sign communications" Windows Settings/Local Policies/Security Options: Digitally sign server communication (Always) >Disabled.