I've set up the trial version of DSS 7 and have set up several test shares. I am using a Windows 2008R2 domain controller for authentication, and I am able to connect to the shares from both PCs and Macs via SMB, but when I try and connect via AFP the Macs just keep popping the authentication window back up over and over. If I set it to allow guest access, I am able to successfully connect as a guest, so it is clearly my tie in to Active Directory that isn't working for AFP, but is for SMB.
And if you are planning to use AppleTalk, then please note that using AppleTalk with one of following bonding modes: balance-rr, balance-xor or broadcast may cost system instability. Please disable bonding or select other bonding modes while using Appletalk.