Trying again, I did not get ProxyPass working with http, but I did with https (as opposed to AJP). Note this means the Tomcat server needs its own SSL certificate in addition to the one used by VisualSVN Server.
--- replace mod_proxy_ajp.so with: LoadModule proxy_http_module bin/mod_proxy_http.so --- change the wiki virtual host: <VirtualHost *:443> ServerName wiki.ourdomain.com ServerAdmin webmas...@localhost SSLEngine on # Only work as a reverse proxy (important!) ProxyRequests Off ProxyPreserveHost On # required to use HTTPS with the proxy SSLProxyEngine on ProxyPass / https://wiki.machine.IP.addr[:port]/ ProxyPassReverse / https://wiki.machine.IP.addr[:port]/ </VirtualHost> --- the SVN virtual host remains unchanged