Error No. 1f4)

Hi list, I've been using RC for a couple of years and now cannot figure out how to resolve this issue: "SERVICE CURRENTLY NOT AVAILABLE! Error No. 1f4)"

This problem began when added a second web server, and every hit to may domain is redirected to it.

This is my actual scenario with two web servers, see http://img62.imageshack.us/img62/4664/schemana4.jpg

below is my apache2 configuration

NameVirtualHost *

<VirtualHost *> ServerName secondhost.domain ServerAlias www.domain

ProxyPreserveHost On
ProxyRequests Off

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

ProxyPass / http://192.168.15.27/
ProxyPassReverse / http://192.168.15.27/

ErrorLog /var/log/apache2/error.log
CustomLog /var/log/apache2/access.log combined

</VirtualHost>

<VirtualHost *> ServerName firsthost.domain ServerAlias mail.domain ServerAdmin webmaster@domain

DocumentRoot /var/www/roundcubemail

 <Directory /var/www/roundcubemail>
     Options Indexes FollowSymLinks MultiViews
     AllowOverride None
     Order allow,deny
     allow from all
 </Directory>

ErrorLog /var/log/rc/error.log
TransferLog /var/log/rc/access.log

</VirtualHost> ----------------------------------------

I'll appreciate any clue to make this thing work

regards

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