[Proftpd-user] Ubuntu 24.04 mod_tls.o seg fault?

I am trying to configure proftpd for using ftps under Ubuntu 24.04 running
in a virtual machine (VirtualBox, in a NAT Network).

   1. I have generated the certificates with certbot and successfully used
   them to provide https with apache
   2. I have installed proftpd and it works in the standard ftp mode.
   3. I have then modified the standard proftpd.conf file by
uncommenting Include
   /etc/proftpd/tls.conf
   4. I have modified modules.conf uncommenting LoadModule mod_tls.c
   5. I have the following tls.conf file:

<IfModule mod_tls.c>
>
  TLSEngine                  on

  TLSLog                     /var/log/proftpd/tls.log

  TLSProtocol                SSLv23

  TLSOptions                 NoCertRequest

  TLSRSACertificateFile      /etc/letsencrypt/live/
> osservatorio.energia.provincia.tn.it/fullchain.pem

  TLSRSACertificateKeyFile   /etc/letsencrypt/live/
> osservatorio.energia.provincia.tn.it/privkey.pem

  TLSVerifyClient            off

  #TLSRequired                on

</IfModule>

and when I use lftp to connect with the following options:

oetools@oeweb:/etc/proftpd$ lftp
> lftp :~> open --user xxxx --port 21 ftps://
> osservatorio.energia.provincia.tn.it
> Password:
> lftp [email protected]:~> ls
> ls: Fatal error: gnutls_handshake: The TLS connection was non-properly
> terminated.
>
and I get the following output in proftpd.log (tls.log remains empty):

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it[...]):
> -----BEGIN STACK TRACE-----

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [0] /usr/lib/proftpd/mod_tls.so(+0x26962) [0x7fb5037e6962]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [1] /usr/lib/proftpd/mod_tls.so(+0x26962) [0x7fb5037e6962]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [2] /usr/lib/proftpd/mod_tls.so(+0x29fae) [0x7fb5037e9fae]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [3] proftpd: (accepting
> connections)(modules_session_init+0x64) [0x5ed9abc83244]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [4] proftpd: (accepting connections)(+0x2981e) [0x5ed9abc5d81e]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [5] proftpd: (accepting connections)(+0x2a239) [0x5ed9abc5e239]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [6] proftpd: (accepting connections)(main+0x648)
> [0x5ed9abc54098]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [7] /lib/x86_64-linux-gnu/libc.so.6(+0x2a1ca) [0x7fb50382a1ca]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [8] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0x8b)
> [0x7fb50382a28b]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): [9] proftpd: (accepting connections)(_start+0x25)
> [0x5ed9abc546b5]

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): -----END STACK TRACE-----

2024-05-21 16:38:57,806 oeweb proftpd[13837]
> osservatorio.energia.provincia.tn.it (osservatorio.energia.provincia.tn.it
> [ ...  ]): ProFTPD terminating (signal 11)


Any help is greatly appreciated!

Roberto

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