Random device has blocked

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I've got a system with very low activity (basically, it runs only about 10
processes; mostly ssh and rsync.)

Aftter it boots up, I cannot log in via ssh because the random device has

There doesn't seem to be much pattern in this; sometimes I can just loop
cat xxx; sleep 1 for a while and it unblocks.  Other times I have to wait
for several hours to be able to log in, and even running rsync on a 2 GB
filesystem apparently doesn't generate enough entropy....

What can I do to generate sufficient entropy in the system?



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