Macfusion: Can't mount SSHFS directory, "Authentication has failed."

I have a problem with Macfusion. After following the instructions here: http://www.kevinfodness.com/using-macfusion-for-sftp-connections-on-osx , I set up an SSHFS connection in Macfusion, and after about 5 seconds got the error "Could not mount filesystem: Authentication has failed." It seems to me that the relevant line in the logfile is "debug1: read_passphrase: can't open /dev/tty: Device not configured". I can't tell if this is a problem with my Macbook or with the Ubuntu server. I have root access on both machines. The anonymized log is below: (SSHServerFS, _______, 12/3/14, 13:05) debug1: /etc/ssh_config line 20: Applying options for * debug1: Connecting to _______ [_______] port _______. debug1: Connection established. debug1: identity file /Users/_______/.ssh/id_rsa type -1 debug1: identity file /Users/_______/.ssh/id_rsa-cert type -1 debug1: identity file /Users/_______/.ssh/id_dsa type -1 debug1: identity file /Users/_______/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 (SSHServerFS, _______, 12/3/14, 13:05) Mount time out detected. Killing task pid 17137 (MFClient, _______, 12/3/14, 13:05) Note status changed for fs (_______) to Failed to Mount (SSHServerFS, _______, 12/3/14, 13:05) debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3p1 Debian-3ubuntu7 debug1: match: OpenSSH_5.3p1 Debian-3ubuntu7 pat OpenSSH_5* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA _______ debug1: Host '[_______]:_______' is known and matches the RSA host key. debug1: Found key in /Users/_______/.ssh/known_hosts:1 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received (SSHServerFS, LACO02 SSH, 12/3/14, 13:05) debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/_______/.ssh/id_rsa debug1: Trying private key: /Users/_______/.ssh/id_dsa debug1: Next authentication method: password debug1: read_passphrase: can't open /dev/tty: Device not configured (SSHServerFS, _______, 12/3/14, 13:05) debug1: Authentications that can continue: publickey,password debug1: No more authentication methods to try. Permission denied (publickey,password). (SSHServerFS, _______, 12/3/14, 13:05) mount_osxfusefs: failed to mount /Volumes/LACO02 SSH@/dev/osxfuse0: Socket is not connected (SSHServerFS, _______, 12/3/14, 13:06) mount_osxfusefs: failed to mount /Volumes/LACO02 SSH@/dev/osxfuse1: Socket is not connected See this, what do?