The cenario is:
One server with only one NIC. The OS in this server is Windows 2012 Standart EN.
We configure the NAT 1723 and GRE 47 in the router to Server (192.168.1.1). Configure a custom VPN Role. The server as dhcp service running. When we connect the PPTP VPN we can access all resources in the network, like ping printers or NAS, but we can't ping server by name or IP.
Trying to ping the VPN IP it pings OK.
From server we try to ping the IP we receive when the VPN is UP it pings OK.
We only can't access server IP address.
We already tried to disable windows firewall, antivirus firewall, antivirus completly stopped, with no luck.
I can't see any logs why this is happening and i need some help. Configuring VPN is so simple that i can't see what i'm missing.
I made the same test's with other 2 server with different IP's but with equivalent schema and the problem is the same.
Need help... Thank you.