kernel: Entropy device is blocking

[sam]

Hi,

I asked freebsd group, but didn't get a solutino for this issue, so I 
try here for a reasonable answer.

Every now and then when I freshly install FreeBSD, I sometimes get an 
error message saying "kernel: Entropy device blocking" when I turn on 
sshd in rc.conf file. I have search around in google but coudln't find a 
 right fix for it.

Your suggestion is highly appreciated.

Thanks
Sam