Hi, Sorry, it's me again. As I mentioned, I set up SoftEther with RADIUS authentication. It works strangely. I can connect from Windows10 with the built-in client... *once*, and when I disconnect and try to connect again, I get "The PPP link control protocol was terminated" error. the recommended solution didn't work: https://docs.microsoft.com/en-us/troubleshoot/windows-client/networking/cann... Ok, I then tried the SoftEther client. It works if I write DEFAULT Auth-Type := LDAP in the users file. But when I try to connect with the built-in Windows client with this setting, on the server side I see a big warning: ldap: WARNING: You have set "Auth-Type := LDAP" somewhere (0) ldap: WARNING: ********************************************* (0) ldap: WARNING: * THAT CONFIGURATION IS WRONG. DELETE IT. (0) ldap: WARNING: * YOU ARE PREVENTING THE SERVER FROM WORKING (0) ldap: WARNING: ********************************************* (0) ldap: ERROR: Attribute "User-Password" is required for authentication Ok, I force the ldap auth, but without it, the authentication doesn't work. As I understand, Freeradius goes through on all methods until it finds one working. But without the mentioned default setting, it doesn't work. How can I use the SoftEther client without it? I can connect with it at least. According to the SoftEther documentation ( https://www.softether.org/4-docs/1-manual/2._SoftEther_VPN_Essential_Archite...) it uses PAP authentication, but I can establish the vpn only with forced LDAP authentication. Why? Thanks, Tamás.