SSH connection from WinCvs

[Didier]

Hi,

I'm trying to establish SSH connection from WinCvs to my CVS server  
(linux).
The server is running fine for a long time, with :pserver: acces from  
WinCvs.
I can also access (for a long time) my account via ssh, with Putty.
=> So I didn't change anything on the server side actually.
I can run "cvs -v" via plink, on the server, from a Windows console.
I get this response:
        Concurrent Versions System (CVS) 1.11.1p1 (client/server)
        ...

I found docs online, explaining how to install Putty plink pagent and  
WinCvs.
=> My WinCvs (1.3.17.2) Preference Settings are:
  [x] SSH client    C:\Util\putty\plink.exe -i  
C:\Util\putty\key-private.PPK
  CVSROOT           :ext:address@hidden:/opt/champion/cvs-dev
(Opale is a Putty saved session)

But I get always the same error message from WinCvs:
cvs checkout: warning: unrecognized response `Syntaxe du nom de fichier,  
de r‚pertoire ou de volume incorrecte.
' from cvs server
cvs [checkout aborted]: end of file from server (consult above messages if  
any)

This looks like this error message described in the cvs help:
warning: unrecognized response `text' from cvs server
If text contains a valid response (such as ok) followed by an extra  
carriage return character (on many systems this will cause the second part  
of the message to overwrite the first part), then it probably means that  
you are using the :ext: access method with a version of rsh, such as most  
non-unix rsh versions, which does not by default provide a transparent  
data stream.  In such cases you probably want to try :server: instead of  
:ext:.  If text is something else, this may signify a problem with your  
CVS server.  Double-check your installation against the instructions for  
setting up the CVS server.

But I tried with :server: it doesn't change anything.
I don't know what to change in the server settings, because it works fine  
in :pserver: mode.

Could anyone give me some ideas ?
Thanks.
        Didier