[Planetlab-users] Permission denied (publickey)

[alessandro.improta at iet.unipi.it]

Dear planetlab users,
    I experienced some strange behaviors on several planetlab machines,
and I wonder if you could give me any help about that. Recently, I am
testing a tool about capacities on planetlab nodes. My procedure from
remote is:

1 - ssh usr at machine 'killall my_program'            // To shut down every
precedent working version of my tool
2 - ssh usr at machine 'rm -fr src; mkdir src'
3 - scp file usr at machine:~/file
4 - ssh usr at machine 'gcc -flags file -o comp_file
5 - ssh usr at machine 'rm -fr log/; mkdir log; nohup ./comp_file -flags >
log/report.txt 2&>1 &'

My program typically tries to send a total of 10-20 Mbps of data in UDP
trains.

Now, I experienced that at the first time some machines complete correctly
the procedure, while the second time (delayed in time) do not accept any
messages giving as result: "Permission denied (publickey)".

Could you please explain me why I am not able to log on that machine
anymore? Am I doing anything wrong in my procedure? Is there any rule I am
breaking?

Thank you really much in advance,
Alessandro Improta