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In regards to the error you received, the system may issue service temporarily
unavailable for more than one concurrent connection in certain circumstances.
Please review/reduce the number of concurrent connections you are submitting,
and try again.
Thank you for you reaction. Indeed when I decrease the number of wget processes running in parallel I get much less Connection timeouts. But when I have only one wget running I still get the Connection timeouts. It runs for 30 seconds or so and downloads a couple of files but then stalls more than a minute.