can you ping it by ip? quoted from
Can't ping VPN client by name
Symptom: you can ping the vpn client by ip but when attempting to ping a vpn client from remote LAN, you get time out.
Resolution: 1) if you have correct DNS and WINS settings, you should be able to ping vpn client by name.
2) If you get the time out with a different ip (for example, ping ip is 192.168.100.7 and real ip is 192.168.100.13), check the dns and wins records and delete the 192.168.100.7.
3) If the dns and wins records don't show the client record, make sure it points to the same and correct dns and wins.
4) If the VPN client doesn't register its DNS, you may need to go the VPN connection properties>networking>TCP/IP. On the DNS tab, enter the DNS server IP in DNS suffix for this connection and check Register this connection's addresses in DNS. Or use ipconfig /registerdns command.
5) Also make sure all computers are pointing to the same DNS.
Robert Lin, MS-MVP, MCSE & CNE
Windows, Network and How to at