Ok I actually missed out a log in Syslog, I was hopign it would appear in auth.log or vsftpd.log, but a crucial message was in Syslog: Failed looking up IP address for RADIUS server [2001 (errcode=9)

No matter in what format I type the IPv6 address (tried with [] brackets, without them, and using alias in /etc/hosts) in the pam_radius_auth.conf, it won't take it. Seems like the pam module is not compatible with IPv6? :(

I have two servers, one server running vsFTPd and second server running Freeradius. Both of them are IPv6only.

I am trying to use vsFTPd with pam_radius_auth module to authenticate via my radius server, but for some reason I am unable to make it work. Freeradius server should be configured properly, I can authenticate via terminal like this:

radtest -6 user pass 2001:xxxx:xxxx:xxxx:xxxx::129 0 radiussecret

Also my other webserver can authenticate via my radius server.

For some reason, it seems liek vsFTPd is not using the right pam module, I don't have any debug message that he attempts to connect to my radius server, or if I remove it from /etc/pam_radius_auth.conf completely, that it cannot find a server to connect to.

Here are my configs:




auth       sufficient  pam_radius_auth.so
account    sufficient  pam_radius_auth.so


radiusserver radiussecret 10

And in /etc/hosts I mapped the radiusserver to its ip address:

2001:xxxx:xxxx:xxxx::129 radiusserver.auth radiusserver

Now when on the FTP server I try to connect with the credentials user:pass, I get the following error:

ftp localhost
Connected to localhost.
220 (vsFTPd 3.0.2)
Name (localhost:student): user
331 Please specify the password.
530 Login incorrect.
Login failed.

In /var/log/auth.log:

 ubuntu vsftpd: pam_unix(ftp:auth): authentication failure; logname= uid=0 euid=0 tty=ftp ruser=user rhost=::1  user=user

and /var/log/vsftpd.log

CONNECT: Client "::1"
[user] FAIL LOGIN: Client "::1"

What is going on? Why is vsFTPd not even trying to connect to my radius server? :( Thank you


In /etc/vsftpd.conf you have:


I think that tells PAM to look for configuration for this service in /etc/pam.d/ftp, rather than /etc/pam.d/vsftpd.

If /etc/pam.d/ftp does not exist, /etc/pam.d/other will get used instead.

  • I was trying various variations of pam_service_name=ftp pam_service_name=vsftp pam_service_name=vsftpd but none really seems to fix my problem. Eventually I left it at ftp, according to askubuntu.com/questions/413677/vsftpd-530-login-incorrect Because when I use "vsftpd", there is nothing showing up in /var/log/auth.log Dec 15 '17 at 20:25

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