tried to SFTP over SSH and get this error
[20:10:40] FlashFXP 5.2.0 (build 3883)
[20:10:40] Support Forums http://www.flashfxp.com/forum/
[20:10:40]
[20:10:40] Winsock 2.2 -- OpenSSL 1.0.2d 9 Jul 2015
[20:11:00] [R] Connecting to 192.168.0.254 -> IP=192.168.0.254 PORT=22
[20:11:00] [R] Connected to 192.168.0.254
[20:11:00] [R] Host key algorithm ecdsa-sha2-nistp256, size 192 bits.
[20:11:00] [R] Fingerprint (MD5): 3e:3a:3d:77:61:66:d8:a8:1a:06:98:d5:c6:86:91:f2
[20:11:00] [R] Key exchange: diffie-hellman-group-exchange-sha256. Session encryption: chacha20-poly1305@openssh.com, MAC: , compression: none.
[20:11:00] [R] Auth Type: Password
[20:11:00] [R] Authentication succeeded
[20:11:00] [R] SSH Connection open
[20:11:00] [R] [info] subsystem request for sftp failed, subsystem not found.
[20:11:00] [R] [execute] /usr/lib/openssh/sftp-server
[20:11:00] [R] [execute] /usr/lib/sftp-server
[20:11:00] [R] [execute] /usr/local/lib/sftp-server
[20:11:01] [R] [execute] /usr/libexec/sftp-server
[20:11:01] [R] [execute] sftp-server
[20:11:01] [R] Connection failed (Unable to access SFTP sub-system, operation failed.)
[20:11:01] [R] Delaying for 10 seconds before reconnect attempt #1