Logging into CentOS 7.5 server with Chroot root set to Jailkit is getting the login failure above for both FileZilla and WinSCP. I can login fine with Putty and the same parameters, I have also tested manual password and regenerating the password. A workaround at present for this user is to set Chroot set to None. I have one user the is working correctly with the Jailkit set however this user was configured prior to upgrading ISPConfig (maybe 3.1.7p1) and also upgrading CentOS from 7.3. Comparing the /home/<user_name> directories shows the working one has a empty .pki dir and empty .profile, so possibly they are additions through some other utility.