I followed your instructions, and could grap the login with the proxy. A
"cookie.txt" has been created in the WinHTTrack download folder (where I want
to download the webpage).

Still, it does not work. The download break almost immediatly after start.

The log file says (blinded to www.webpage.dm):

15:44:28 Warning:  Note: due to www.webpage.dm remote robots.txt rules, links
beginning with these path will be forbidden: /administrator/, /cache/, /cli/,
/components/, /images/, /includes/, /installation/, /language/, /libraries/,
/logs/, /media/, /modules/, /plugins/, /templates/, /tmp/ (see in the options
to disable this)
15:44:28 Warning:  See other for
www.webpage.dm/index.php/component/users/?task=user.login?>postfile:T:\Windows\Desktop\webpage\webpage\hts-post2
15:44:28 Warning:  File has moved from
www.webpage.dm/index.php/component/users/?task=user.login?>postfile:T:\Windows\Desktop\webpage\webpage\hts-post2
to <http://www.webpage.dm/index.php/members/registrieren>
15:44:29 Warning:  No data seems to have been transferred during this session!
: restoring previous one!


The corresponding hts-post0 files do not seem to have an error. Also, the
cookie.txt seems right.
Could it be that the webpage is protected against robots?
Cheers!