Here is the part of the Plesk panel log:
[18-Aug-2014 18:25:58 Europe/Berlin] PHP Fatal error: Uncaught exception 'Servi
ce_Driver_Exception' with message 'Can not reload proxy server: ' in /usr/local/
psa/admin/plib/Service/Driver/Web/Proxy/Nginx.php:116
Stack trace:
#0 /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php(86): Service
_Driver_Web_Proxy_Nginx->restart()
#1 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(212): Template_W
riter_Webserver_Abstract->restart()
#2 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(112): Template_C
onfiguration_Applier->_applyConfigurationsToServiceNode(1, Array)
#3 [internal function]: Template_Configuration_Applier->applyConfiguration()
#4 {main}
thrown in /usr/local/psa/admin/plib/Service/Driver/Web/Proxy/Nginx.php on line
116
#4 /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php(86): Service_Driver_Web_Proxy_
Nginx->restart()
#5 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(212): Template_Writer_Webserver_Ab
stract->restart()
#6 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(112): Template_Configuration_Appli
er->_applyConfigurationsToServiceNode(1, Array)
#7 [internal function]: Template_Configuration_Applier->applyConfiguration()
#8 {main}
[18-Aug-2014 18:25:58 Europe/Berlin] PHP Fatal error: Uncaught exception 'Service_Driver_Exceptio
n' with message 'Can not reload proxy server: ' in /usr/local/psa/admin/plib/Service/Driver/Web/Pr
oxy/Nginx.php:116
Stack trace:
#0 /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php(86): Service_Driver_Web_Proxy_
Nginx->restart()
#1 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(212): Template_Writer_Webserver_Ab
stract->restart()
#2 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(112): Template_Configuration_Appli
er->_applyConfigurationsToServiceNode(1, Array)
#3 [internal function]: Template_Configuration_Applier->applyConfiguration()
#4 {main}
thrown in /usr/local/psa/admin/plib/Service/Driver/Web/Proxy/Nginx.php on line 116
~
#4 /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php(86): Service_Driver_Web_Proxy_Nginx->restart()
#5 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(212): Template_Writer_Webserver_Abstract->restart()
#6 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(112): Template_Configuration_Applier->_applyConfigurat
ionsToServiceNode(1, Array)
#7 [internal function]: Template_Configuration_Applier->applyConfiguration()
#8 {main}
[18-Aug-2014 18:25:58 Europe/Berlin] PHP Fatal error: Uncaught exception 'Service_Driver_Exception' with message 'Can
not reload proxy server: ' in /usr/local/psa/admin/plib/Service/Driver/Web/Proxy/Nginx.php:116
Stack trace:
#0 /usr/local/psa/admin/plib/Template/Writer/Webserver/Abstract.php(86): Service_Driver_Web_Proxy_Nginx->restart()
#1 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(212): Template_Writer_Webserver_Abstract->restart()
#2 /usr/local/psa/admin/plib/Template/Configuration/Applier.php(112): Template_Configuration_Applier->_applyConfigurat
ionsToServiceNode(1, Array)
#3 [internal function]: Template_Configuration_Applier->applyConfiguration()
#4 {main}
thrown in /usr/local/psa/admin/plib/Service/Driver/Web/Proxy/Nginx.php on line 116