Which user rights needed to use ssh tunnel

[Lutz Wrage]

I use cygwin sshd on a Windows 2003 server. This is used to connect to a cvs 
repository through ssh. Some users get access to the repository (administrators) 
but others don't. They get errors about invalid user or invalid password.
Which rights does a windows user (on the server) need in order to be able to 
connect through a ssh tunnel? The users that can't connect have now no rights 
except connect to the machine over the network. Is this documented anywhere?

Thanks,
Lutz

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