Server can not be able to ping

It is not recommended to use Windows Firewall on a RRAS server.
If you use the server as a router, you should enable NAT;
if you use the server as VPN, you should have another firewall.
If, for some reasons, you do want to enable Windows Firewall in the Windows 2003, you may need to disable the RRAS.
To do that, right-click on My Computer>Manager>Services and Applications>Services. Disable Routing and Remote Access service

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