In the last few releases, Synology has added L2TP/IPSec as an option for a VPN. I’ve never been able to get it to work on a Windows client until today.
- IPSec – UPD 500
- IPSec NAT Traversal – UDP 4500
- L2TP – UDP 1701
Fix on Windows clients – http://support.microsoft.com/kb/926179
- For Win7 and Win8 Machines
- New DWORD (32-bit) – AssumeUDPEncapsulationContextOnSendRule
- Set the Value Data to 2
Using OpenVPN with port 443, for easier access: http://forum.synology.com/enu/viewtopic.php?t=45545#p215354
Very helpful post and it effectively resolved my issue of accessing my Synology VPN from my win 7 laptop. thank you.
I struggle with this issue the whole afternoon. Your trick did it!
Now if there was only a way to make this fix on a Windows 8.1 Update 1 Phone
Thank you – this short and direct little post told me exactly what I needed to know.
Worked after a reboot after having added the key.
Found that very helpful as well.This also worked on a Win8.1 non-pro after restart. Thanks for sharing !
Awesome, it worked for me on Synology DS415+, VPN connects very well but I am still having problem with seeing the shared folder in DS or even seeing whole Synology while VPN connected to the LAN however according to DSM my windows 7 pc can get IP from different Subnet. Any idea to resolve this issue?Thanks
This also works on Win10 (evaluation install)
I add the registry key, but I cannot connect to the VPN.
With Apple, Android System it works fine.
But no change to connect via Windows 10.
There are two services that need to be running on a windows system:
IKE and AuthIP IPsec Keying Modules & IPsec Policy Agent
Change them both to automatic and start them and you should be right!
Thanks, thanks, thanks,
Lot of time searching, trackking, debugging and now with a simple “2” value in the registry.
Thank youuuuuuu – “2” value in the reg fixed mine
Thanks. Now LT2P working between my Surface and Synology
Wow. It’s awesome. I finally succeeded to connect to the VPN server from my Surface Pro(windows 10). Reboot is required after adding the variable to the registry. Thank you so much aaron.
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