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Today we are using Shrewsoft VPN client L2TP/IPsec IKEv1 to access the office, remote access VPN with a shared key. I am trying to tweak our current Cisco ASA 5505 configuration through asdm so I can use Windows 10 Native VPN instead of shrewsoft client.

My VPN knowledge is pretty limited, but I have figured out that I get an mismatch error on phase 1 (from the Asa 5505 syslog window when trying to connect). It seems like the router is using DH group 2, and windows is using DH group 5.

Where do I find what isakmp policy the windows client is using, so I can match those on the router? Is it possible to change this policy? I can only find settings for some authentication (CHAP/PAP) and data encryption...

Some advice how to change these DH and encryption methods in asdm would also help.

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Can't help on the Windows side, but on the ASDM side, go to:

Configuration > Remote Access VPN > Network (Client) Access > Advanced > IPsec > IKE Policies

For more details see the Cisco ASA Series VPN ASDM Configuration Guide

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