windows-server can't access L2TP from outside network

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Server 1 Lenovo:

  • ADDS
  • DNS
  • NPAS (RADIUS)
  • static IP

Server 2 dell:

  • IIS
  • RRAS / remote access
  • static IP

Remote access makes an authentication with NPAS (RADIUS) PPTP works intern and extern L2TP only work intern.

I want to make a connection with L2TP using an extern public ip.

I have an extern IP from ISP what work with PPTP and L2TP, but L2TP only on Intern network.

Question: How can I access my L2TP from outside my network, I already portforward the IP and PORT.

I tried to turn off my firewall connection to test it the problem was solved. But it didn't. I have portforwared port 1701 in my modem. I tried something with NAT but with no results.

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