Hello and thanks for your quick reply.
Concerning 1), I configured the conn toolbox before trying to run my script. So it seems that it is not working and I will, from now on, add the line of code you suggested instead in all my scripts.

I added the 2 commands you suggested to my script, the jobs were parallelised but, still failed to run. Please find enclosed the zipped log file.
Your help would be very appreciated,
Best regards,
s.