Merci, donc j'ai pu mettre le mode debug :
03/04/2014 11:44:43 | | Re-reading cc_config.xml
03/04/2014 11:44:43 | | Not using a proxy
03/04/2014 11:44:43 | | log flags: file_xfer, sched_ops, task, sched_op_debug
03/04/2014 11:44:56 | Collatz Conjecture | update requested by user
03/04/2014 11:44:59 | Collatz Conjecture | sched RPC pending: Requested by user
03/04/2014 11:44:59 | Collatz Conjecture | [sched_op] Starting scheduler request
03/04/2014 11:44:59 | Collatz Conjecture | Sending scheduler request: Requested by user.
03/04/2014 11:44:59 | Collatz Conjecture | Requesting new tasks for CPU and ATI
03/04/2014 11:44:59 | Collatz Conjecture | [sched_op] CPU work request: 583713.42 seconds; 1.33 devices
03/04/2014 11:44:59 | Collatz Conjecture | [sched_op] ATI work request: 161204.52 seconds; 0.50 devices
03/04/2014 11:45:22 | Collatz Conjecture | Scheduler request failed: Server returned nothing (no headers, no data)
03/04/2014 11:45:22 | Collatz Conjecture | [sched_op] Deferring communication for 00:01:50
03/04/2014 11:45:22 | Collatz Conjecture | [sched_op] Reason: Scheduler request failed
03/04/2014 11:45:23 | | Project communication failed: attempting access to reference site
03/04/2014 11:45:26 | | Internet access OK - project servers may be temporarily down.
Lorsque j'essaie d'accéder à Collatz via navigateur, ça fonctionne mais c'est plus lent que la normale, jusqu'à 10 sec d'attente mesurée par Firefox.