[users@httpd] Permission denied virtualhost alias

[Bocalinda]

Hi,

I got the following parameters in my VirtualHost configuration:

<VirtualHost *:80>
    ServerName www.someserver.com
    ServerAlias www.otherserver.com
    ServerAlias otherserver.com

    DocumentRoot /var/www/public_html
    ErrorLog /var/log/apache2/error_log
    CustomLog /var/log/apache2/access_log combined

    DirectoryIndex index.html index.htm index.php index.php4 index.php5

    <Directory /var/www/public_html>
        Options -Indexes +IncludesNOEXEC +FollowSymLinks
        allow from all
        AllowOverride All
    </Directory>
</VirtualHost>

I can access without any problems to www.someserver.com and
www.otherserver.com, but otherserver.com (w/out www) returns HTTP error 304:
Permission Denied.
I'm clueless about what the reason could be.

Note that all hostnames are pointing to the same IP address.

Any help would be kindly appreciated.