VPN worked with Vista client, but breaks with Win7 client

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http://serverfault.com – I have a VPN with WinServer2003 on the host side and Vista (x64) as the client. The Vista client (192.168.0.nnn) connects daily to the VPN to backup all the machines on the host side (10.1.nnn.nnn). This has been working fine for about 3 years. I'm trying to replace the Vista client machine with a newer machine running Win7 (also x64). The Win7 machine connects to the VPN OK, but can't ping any of the host-side machines by name (by NetBIOS name, that is). It can ping them by IP address fine (ping I still have the old Vista client running - it still works fine ("ping wilkins" w (HowTos)