Looks like I found a bug in ISPC 126.96.36.199. In our cluster configuration sites-enabled folder does not get updated after site name change. This results in web server malfunction that normal restart can't fix. root@wiki1:~# /etc/init.d/apache2 restart apache2: Syntax error on line 230 of /etc/apache2/apache2.conf: Could not open configuration file /etc/apache2/sites-enabled/smw1.domain1.info.vhost: No such file or directory Action 'configtest' failed. The Apache error log may have more information. failed!