Accessing Nokia N900 ssh via USB
After some time, I have been able to solve my issue.


Installed OpenSSH (server) from Application Manager
Connected the N900 to the Mac via USB and selected PC-Suite Mode
On the N900, as root, issued ifup usb0 (activates USB)
On the N900, as root, issued /etc/init.d/ssh start (starts OpenSSH)
On the Mac, in Network Preferences (under System Preferences), selected the N900 and configured it manually to have the IP Address 192.168.2.14 and the Subnet Mask 255.255.255.0 (at this point the N900 appears as correctly connected)
On the Mac, in Terminal, issued ssh root@192.168.2.15


At this point a confirmation is requested and I am prompted for the root password. Connection is then established.

I post all this in the hope of being useful to somebody, maybe with a different device. To be honest I do not understand fully all the passages, especially where I set the IP Address for the N900 as ...14 on the Mac, while by issuing ifconfig on the N900 the reported Address is ...15, and this has to be used in the final ssh command.

If anybody has comments which may me help to understand better what I have been doing, I would appreciate that.