Exactly the same problem with me.
Sent the work to that secondary server after 3 failed atempts on the primary server.
I will post my log when I get home.
Its a shame to lose work
I had the same problem with Project: 2605 (Run 15, Clone 87, Gen 72).
So if anyone could check if the WU arrived safely (and some points would be nice too )
Thank you.