Error read: Connection reset by peer when sshfs is using.

sshfs -o nonempty user@aaa:  /home/user/links/

check the following line (or similar) exists in /etc/ssh/sshd_config of aaa

Subsystem       sftp    /usr/libexec/openssh/sftp-server

sometime, change the path of sftp-server or install some..., and restart sshd server.