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Old 06-27-2001, 09:13 PM   #1
Registered: Jun 2001
Location: New Jersey
Distribution: Redhat 7.1
Posts: 36

Rep: Reputation: 15
Post ftp question about 500 AUTH not understood


I am trying to setup Proftpd on Redhat Linux 7.1. It is up and running (using PAM), but everytime I connect I get this:

220 ProFTPD 1.2.1 Server (ProFTPD Server)
500 AUTH not understood.
500 AUTH not understood.
KERBEROS_V4 rejected as an authentication type

Can anyone tell me what the AUTH not understood means?

Thanks in advance,
Old 04-06-2002, 12:13 AM   #2
Registered: Mar 2002
Posts: 41

Rep: Reputation: 15
Clients are getting this message when they try to ftp into me. I am behind a firewall.....Please help !
Old 05-01-2002, 01:53 AM   #3
LQ Newbie
Registered: May 2002
Distribution: Mandrake 8.2
Posts: 2

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I have same problem

Did anyone figure this out? I see exactly the same problem trying to log into the proftpd server on my Mandrake 8.2 installation.
Thanks for any pointers.
Old 05-01-2002, 04:34 AM   #4
Senior Member
Registered: Dec 2001
Location: The Netherlands
Distribution: Ubuntu
Posts: 1,316

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It is only a warning message. The client is trying to login using an authentication method which is not supported by the server. The client should then proceed using the normal login method, which is unsafe because passwords gets sent in clear text over the network.
Old 05-02-2002, 08:35 PM   #5
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Registered: May 2002
Distribution: Mandrake 8.2
Posts: 2

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i see

Ah, but then it goes on to not allow any users to log in.

I guess that is a separate problem and I need to go rtfm. thanks though.
Old 07-29-2003, 09:52 AM   #6
LQ Newbie
Registered: Jul 2003
Location: Germany
Distribution: Gentoo 1.4_rc4
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okay i had the same problem.
If you aren't able to login or get something like that read my solution

Connected to localhost.
220 ProFTPD 1.2.9rc1 Server ( - FTPServer) []
Name (localhostatrick): test-user
500 AUTH not understood
331 Password required for test-user.
530 Login incorrect.
Login failed.
Remote system type is UNIX.
Using binary mode to transfer files.

I was sure to use the right password but the proftpd wasn't able to read out the passwd and the shadow file (mod was: -rw-------)

One solution was to use the AuthUserFile [path] directive and to create a extra passwd-File for the FTP-User.
The other solution was to change the permissions of the passwd and shadow file (dangerous) to -rw-rw-rw- (-rw-r--r-- should also work)

Last edited by Reppy; 07-29-2003 at 09:57 AM.


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