title: Softether VPN with Apache Reverse Proxy
body: <p>I have a (azure) server where redmine and Softether VPN is running. Apache httpd distibute the requests to redmine and Softether.</p>
  <p>Redmine is working without any problems but I'm not able to use the VPN Server. The connection from the Sothether Client to the server works but I don't get a valid IP Adress from the DHCP.
  In the apache logs I get the warning:</p>
  <pre><code>AH03408: HTTPS: reusable backend connection is not empty: forcibly closed
  </code></pre>
  <p>On the Softether log I get this error:</p>
  <pre><code>On the TCP Listener (Port 443), a Client (IP address ..., Host name &quot;...&quot;, Port number 7736) has connected.
  For the client (IP address: ..., host name: &quot;...&quot;, port number: 7736), connection &quot;CID-32-58873B8941&quot; has been created.
  SSL communication for connection &quot;CID-32-58873B8941&quot; has been started. The encryption algorithm name is &quot;TLS_AES_256_GCM_SHA384&quot;.
  Connection &quot;CID-32-58873B8941&quot; has been terminated.
  </code></pre>
  <p>Apache httpd-ssl.conf:</p>
  <pre><code>
  &lt;VirtualHost *:443&gt;
      ServerName ...
      
      SSLEngine On
      SSLProxyEngine On
      ProxyRequests Off
      ProxyPreserveHost Off
      
      ProxyPass / https://localhost/ timeout=3600
      ProxyPassReverse / https://localhost/
      
      SSLCertificateFile &quot;${SRVROOT}/conf/cert.pem&quot;
      SSLCertificateKeyFile &quot;${SRVROOT}/conf/privkey.pem&quot;
      SSLCertificateChainFile &quot;${SRVROOT}/conf/fullchain.pem&quot;
      
      ErrorLog &quot;${SRVROOT}/logs/vpn-error.log&quot;
      TransferLog &quot;${SRVROOT}/logs/vpn-access.log&quot;
      
      &lt;FilesMatch &quot;\.(cgi|shtml|phtml|php)$&quot;&gt;
          SSLOptions +StdEnvVars
      &lt;/FilesMatch&gt;
      &lt;Directory &quot;${SRVROOT}/cgi-bin&quot;&gt;
          SSLOptions +StdEnvVars
      &lt;/Directory&gt;
      
  &lt;/VirtualHost&gt; 
  
  </code></pre>
  <p>What I'm doing wrong here?</p>