cygstart does not pass correct ssh login to rsync

[John tel]

Hi,
 
I've got a strange problem when combining cygstart with rsync.
 
So using cygstart and ssh to login works:
cygstart ssh -p 1000 -i /home/user/key admin@192.168.1.11
 
Using rsync on its own works:
rsync -PaSh --delete -e 'ssh -p 1000 -i /home/user/key' /cygdrive/C/Users/User/Desktop/ admin@192.168.1.11:/destination/
 
But combining cygstart and rsync does not as the ssh login fails and it asks for the passwrod instead:
cygstart rsync -PaSh --delete -e 'ssh  -vvv -p 1000 -i /home/user/key' /cygdrive/C/Users/User/Desktop/ admin@192.168.1.11:/destination/
 
Unfortunately despite using the -vvv flag, no error message appears other than the request for the user password.
 
 
Does anyone have any ideas as to how to resolve this?
 
Thanks

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