"System error 67 has occurred." with SSHDroid Android Server

Bug Report

I get "System error 67 has occurred." when connecting to a server running on a mobile Android device using SSHDroid.

I can successfully connect to the server with WinSCP.

I tested this with both:

• sshfs-win-2.7.17334-x64 / winfsp-1.2.17346
• sshfs-win-3.5.19106-x64 / winfsp-1.5.19090

On the Windows 10 client side, I am using this command and I am getting the following output:

> net use P: \\sshfs\root@mobile\
The password is invalid for \\sshfs\root@mobile\.

Enter the username for 'sshfs': root
Enter the password for sshfs:
System error 67 has occurred.

The network name cannot be found.

I can see from the server log that the connection is established, the authentication is successful, but connection is then immediately closed.

How to Reproduce

• on Android device, setup SSHDroid and start server on standard port 22 (grant root access)
• on Windows 10 x64 client, install sshfs and winfsp
• from command prompt, execute net use P: \sshfs\root@mobile\

Behaviors

Remote server should be mounted to drive.

Environment

• OS version and build: Windows 10 64bits Version 1803 (OS Build 17134.706)
  SSHDroid
• WinFsp version and build:

• sshfs-win-2.7.17334-x64 / winfsp-1.2.17346
• sshfs-win-3.5.19106-x64 / winfsp-1.5.19090

Start by reproducing the reported net use P: \\sshfs\root@mobile\ command with the listed sshfs-win and WinFsp versions, then compare the client behavior with the SSHDroid server log. Done means identifying why the authenticated connection closes and allowing the remote server to mount as a drive.