svn copy error

Hi all,

I have a problem with svn copy and https server: I get the famous '502
bad gateway' error.

I googled and I found this issue is related to apache configuration. But
  I don't understand why it works with http and not with https.

In my httpd.conf I have a virtual host
<VirtualHost ipaddress:443>
   ServerName svn.sub.domain.com
   <Location /svnroot/sources>
     DAV svn
     SVNPath /svnroot/sources
     AuthzSVNAccessFile /svnroot/sources/.SVNAccessFile
     Require valid-user
     AuthType Basic
     AuthName "Subversion Authorization"
     AuthUserFile /etc/httpd/conf/htpasswd
   </Location>
</VirtualHost>

And when I make a copy on
https://svn.sub.domain.com/svnroot/sources/trunk toward
https://svn.sub.domain.com/svnroot/sources/tags/first

I get the 502 error :/

I have no idea where I can look for doc about this (even I already read
the apache conf doc)

Regards
Manuel

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# VACELET Manuel     manuel.vacelet-abecedaire(at)st(dot)com #
# Tel:  042 6089                          +33 (0)476 92 6089 #
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