<VirtualHost *:443>

    SSLEngine on

    DocumentRoot /var/www/

    <Directory />
        Options FollowSymLinks
        AllowOverride None
        Order deny,allow
        Deny from all
        Allow from 127.0.0.1
        allow from 192.168.
        allow from 10.8.0
    </Directory>

    ...

    ProxyRequests Off
    ProxyPreserveHost On
    ProxyVia On

    SSLProxyEngine on
    <Location /AutodeskDM>
        Order Deny,Allow
        Deny from all
        Allow from 192.168.
        ProxyPass https://10.8.0.131/AutodeskDM
        ProxyPassReverse https://10.8.0.131/AutodeskDM
    </Location>

    <Location /autodeskdm>
        Order Deny,Allow
        Deny from all
        Allow from 192.168.
        ProxyPass https://10.8.0.131/autodeskdm
        ProxyPassReverse https://10.8.0.131/autodeskdm
    </Location>

....

</VirtualHost>

[error] [client 127.0.0.1] client denied by server configuration: proxy:http://10.8.0.131/AutodeskDM/

Allow from 127.0.

<Proxy *>
    Order deny,allow
    Deny from all
    Allow from 192.168.
</Proxy>