I have just upgraded my hosts' amanda clients from 2.4.4p4 to 2.5.1p2, and I
have a weird problem where most of my clients are no longer providing
results, instead I get for each of them a line resembling this:
...
  host1        da0s1a     lev 0  FAILED [missing result for da0s1a in host1
response]
...
host1 da0s1a   0 FAILED --------------------------------------------
...

amcheck shows 0 errors when I run a scan and it purports to find all of the
hosts and file systems.

Where should I look for why this may have happened?

--
 Mark Hennessy