A common configuration failure in an L2TP/IPSec connection is a misconfigured or missing certificate, or a misconfigured or missing preshared key. If the IPSec layer cannot establish an encrypted session with the VPN server, it will fail silently. As a result, the L2TP layer does not …
On the L2TP Users tab you need to set an IP Pool, this is the available addresses that L2TP Users can draw from when connecting. You may also set User Group for the L2TP clients. CAUTION: Setting to small of an IP Pool will result in IP Exhaustion, make sure to use a suitably large pool of addresses. How to troubleshoot a Microsoft L2TP/IPSec virtual private A common configuration failure in an L2TP/IPSec connection is a misconfigured or missing certificate, or a misconfigured or missing preshared key. If the IPSec layer cannot establish an encrypted session with the VPN server, it will fail silently. As a result, the L2TP layer does not … L2TP VPN fails with error 787 - support.microsoft.com
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