False unreachable?

[Ted Bedwell]

Hi all,
  I've have rancid running on 300+ devices. I have a few however claim that they are unreachable. I get the:

"The following routers have not been successfully contacted for more
than 4 hours"

email on every polling cycle. The logs state:

"my.device clogin error: Error: Connection Refused (telnet)"

However, I can clogin just fine from the command line. 

Any ideas where I can being investigating this further?

Thanks,
~~ted