I've got two machines that I attached to Einstein about a week ago. They both download and happily crunch away, but they aren't able to send data back. The following is from the log, there are many entries that look like this. SETI@home works fine on these two machines.
2/18/2006 12:21:39 AM|Einstein@Home|Started upload of z1_0714.0__347_S4R2a_0_0
2/18/2006 12:21:50 AM||Attempting to send data to [einstein.phys.uwm.edu] failed [failed sending data to the peer]
2/18/2006 12:21:50 AM|Einstein@Home|Temporarily failed upload of z1_0714.0__347_S4R2a_0_0: system write
2/18/2006 12:21:50 AM|Einstein@Home|Backing off 1 hours, 12 minutes, and 8 seconds on upload of file z1_0714.0__347_S4R2a_0_0Does Einstein use an odd protocol (like RSYNC) to send results?
This was almost certainly because we had some problems (first in eight months) with our project server. Hopefully now fixed -- just wait for the next upload attempt, or if impatient you can use the 'retry now' button on the transfer menu to make the upload happen right away.
Cheers,
Bruce

failed sending data to peer
)
I've looked at the server side and don't see evidence of problems.... so I don't understand what's going wrong.