Bug#926719: SFTP ProFTPD terminating (signal 11) after Update to 1.3.5e-0+deb8u1

[Ghislain Adnet]

> Could you send me your sftp configuration snippet for proftpd and tell
> me more about your setup? How can you connect via command-line sftp but
> not via filezilla?

i use the unmodified package with this sftp configuration


   <IfModule mod_sftp.c>
     <VirtualHost 0.0.0.0 >
         SFTPEngine on

         AllowOverwrite          on
         RequireValidShell       off

         # Configure the server to listen on the normal SSH2 port, port 22
         Port 2221


         SFTPHostKey /etc/ssh/ssh_host_rsa_key
         SFTPHostKey /etc/ssh/ssh_host_dsa_key

         SFTPAuthorizedUserKeys file:~/.sftp/authorized_keys

         SFTPCompression delayed

         MaxLoginAttempts 6
         DefaultRoot ~
         Umask 0026 0027
     </VirtualHost>
   </IfModule>



as i said numerous customer reported issues connecting in sftp following the upgrade. We had to rollback and everything 
worked again. Client used where :filezilla and dreamweaver, both up to date.

my command line client ( command SFTP) on ubuntu 18.04 was able to connect but not fillezilla. After rollback to 
previous version both client worked. The new version On debian 9 it works, but on debian 8 it fails.


Ghis.