error: subsystem: cannot stat /usr/libexec/sftp-server

Unable to connect SFTP  via FTP client on Plesk server.

FTP logs show following:

Notice
sshd[5869]: subsystem request for sftp
error: subsystem: cannot stat /usr/libexec/sftp-server: 
No such file or directory

As mentioned in the error, file /usr/libexec/sftp-server was not present. 
To fix this problem you can refer to following steps:

1) 

root@office1 [~]#locate sftp-server
/usr/libexec/openssh/sftp-server

2) Edit ssh configuration file /etc/ssh/sshd_config and comment 
the line containing "/usr/libexec/sftp-server"

and add new line which
will look like “Subsystem      sftp     /usr/libexec/openssh/sftp-server”

# override default of no subsystems
#Subsystem      sftp    /usr/libexec/sftp-server
Subsystem      sftp     /usr/libexec/openssh/sftp-server

3) reload sshd service


root@server[~]#/etc/init.d/sshd reload

Now try connecting to SFTP. It will work.