You are trying to use SSL v3.... most (savvy?) system administrators disable
support for SSL v3 for security reasons
DokuWiki doesn't seem to hardcode the SSL version used in the SSL Tunnel CONNECT protocol - so it's likely the problem lies in xampp.
Take a look at
c:\xampp\apache\conf\extra\httpd-ssl.conf for the lines:-
SSLProtocol All -SSLv2 -SSLv3
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If they are not there - add them and test the results.
There is also an old DokuWiki
issue that may be relevant.