Unable to connect l2tp using radius

Hi,

[ASL 8.203]

I'm unable to setup a VPN connection using L2TP and RADIUS as authentication server.

Radius is setup fine. When I use the test button I get the following reply:

User authentication:
Authentication test passed.

User is a member of the following groups:
Radius Users

The Radius server is listed on first position on the authentication servers tab.

However, when setting up the L2TP connection from a client (Windows 7, iPad, iPhone) it fails to connect. The live log of ASL shows the following:

2011:12:18-03:27:00 firewall pppd-l2tp[29463]: rcvd [CHAP Response id=0x43 <6651a247d160141ed96adce79556a13d0000000000000000f 06d50867fae32c4bbf91f92c02bd246bd67f18f8f7be56f00> , name = "<user name>"]
2011:12:18-03:27:00 firewall pppd-l2tp[29463]: rc_check_reply: received invalid reply digest from RADIUS server
2011:12:18-03:27:00 firewall pppd-l2tp[29463]: Peer <user name> failed CHAP authentication

Using local authentication on ASL everything works fine.

What am I doing wrong?

Franc.