Dan,

Current sshserver.pl is searching for sshd in PATH and for the
sftp-server plugin in a given set of locations.

If sshd happens not to be found in the PATH, tests 6XX fail.

I've been able to complete 6XX tests on Cygwin using the attached patch.

With it sshd and sftp-server are both searched first in the PATH and
afterwards in the given set of locations.

-- 
-=[Yang]=-