VPN with SMB (File Sharing) and Total Commander

[WPCentral Question]

Hey!

I just configured a Windows 7 VPN-Server (with nativ tools) and connect now my Windows 10 Mobile Phone (L950) via PPTP. This connection works like a charm.
But I can't ping nor connect via SMB (Windows File Sharing) with my L950 to my W7 PC (Server). If I try to ping the Server (192.168.188.1) from my L950 it says "connection failed", if I try to ping the L950 (192.168.188.4) with my Server it works perfect.
If I try to connect with my home Windows 10 PC to the VPN and then try to ping 192.168.188.1 it works also perfect!

Also if I try to connect to SMB with Total Commander for Windows Phone it failes. If I use the Server Name to connect to the Server Total Commander say after ~5secs: "Connection failed!". If I try to connect to the IP directly (192.168.188.1) it say after ~30secs: "Transport1 timedout waiting for response to SmbComSessionSetupAndX[command=SMB..."

Is there any chance, that I can access the files of the Server on my L950 via VPN?

Thanks in Advance,
Spider