I know this one is really old, but I have the very same issue in my X86-64 installation running 19.07.4.
What I want to achive: ACME running on router vm that shall distribute wildcard-certificate to several vms after each renewal.
Router: 192.168.1.1 a.k.a 192.168.100.1
Ubuntu vm: 192.168.100.4
Ubuntu folder I need access to: /etc/ssl/private/folder
openwrt folder for mounting: /etc/ssl/private-192.168.100.4
key file /etc/ssh/id_rsa
content of /etc/ssh/id_rsa.pub has been inserted into Ubuntu's authorized_keys file
Ubuntu's ssh daemon is listening to port 100
So by following each single tutorial in the web the instruction should be:
root@Router:~# sshfs -o IdentityFile=/etc/ssh/id_rsa -p 100 root@192.168.100.4:/etc/ssl/private/folder /etc/ssl/private-192.168.100.4
fuse: failed to open mountpoint for reading: Permission denied
Can someone help? Connecting as root via winscp (after converting private key from openssh format to putty format) works from client device 192.168.100.100.
edit: This seems to have been a leftover problem of former nfs tests I did. umount /etc/ssl/private-192.168.100.4 followed by a reboot solved the problem