L2TP/IPsec VPN from Windows 10 fails with error "remote server is no responding..." - Powered by Kayako http://servis.xenon-forte.si/index.php? Help Desk Software

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L2TP/IPsec VPN from Windows 10 fails with error "remote server is no responding..."

Posted by Silvo Kraševec, Nazadnje spremenjeno s strani Silvo Kraševec on 16 September 2018 10:12 PM

Resolution

By default, Windows L2TP/IPsec VPN client does't support connections to VPN servers located behind NAT devices. To enable NAT Traversal (NAT-T) support, make following registry change:

Open regedit.exe
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\PolicyAgent
Create a new DWORD 32 type value:
- Name: AssumeUDPEncapsulationContextOnSendRule
- Data: 2
  0 - No connection to servers behind NAT (Default).
  1 - Connection where VPN server is behind NAT.
  2 - Connection where VPN server and client are behind NAT.
Reboot computer

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