You may want to keep an eye on the Problems and Technical Issues with Rosetta@home thread. Several users have reported the same problem there and one of the project team members has replied to say they are investigating.

krypton wrote:

Thanks for the reports!! We are looking at this now.

Each BOINC project periodically sends out new versions of their application. This would mean that there is an executable file that must pass through a/v or firewall protections. It also means a new name of allowed exception might need to be defined, depending on how specifically the exceptions are named.

So, that might be a reason why it would be working one day and not the next, and why I suggested it as a thing to check in to.

More likely that an anti-virus or firewall has interfered with the executable in some way, or the permissions for the BOINC user are not sufficient to allow it to run.

For those of use who had to alter the hosts file in order to get outstanding WU's to upload and then removed the alteration, will future uploads work OK?