I switched succesfully to cygwin V1.7.5 and it seems to work great :-)
4 things are to be emphasized:
1) usernames in v1.5 are case insensitive but not in v1.7.5.
e.g. ssh Meyer@cygwinhost is not the same as ssh meyer@cygwinhost
  http://cygwin.com/ml/cygwin-announce/2010-03/msg00007.html

2) sshd_config:
"AuthorizedKeysFile .ssh/authorized_keys" is not the same
as "#AuthorizedKeysFile .ssh/authorized_keys".
I have to remark the line in v1.7.5 but not in v1.5.
  http://cygwin.com/ml/cygwin-announce/2010-04/msg00026.html

3) I've installed the cygwin v1.7.5 in the same directory as the v1.5
before. In this case all the cygnus keys within the registry have to be
removed. If someone install v1.7 in another directory as v1.5 they can work
in parallel.

4) within Vista some windows programs (e.g. attrib) have problems with
junction points if they run under a user with privilege SeBackupPrivilege.
This can be solved by: "cygdrop -p SeBackupPrivilege attrib /S /D ..."

thanks to the newsgroup cygwin AT cygwin DOT com for their help in solutions :-)

br
Matthias
-- 
Don't Panic


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