Unable to reread IP addresses. The following error is shown if debug mode is enabled:
# /usr/local/psa/bin/ipmanage --reread IP addresses were reread from the system. [2016-01-26 12:54:48] ERR [util_exec] proc_close() failed ['/usr/local/psa/admin/bin/apache-config' '-t'] with exit code  Error occurred while sending feedback. HTTP code returned: 502 [2016-01-26 12:54:50] ERR [panel] Apache config (14538092870.59201100) generation failed: Template_Exception: Syntax error on line 27 of /etc/httpd/conf/plesk.conf.d/server.conf: The address or port is invalid
0.0.0.0/0 IP address is added to IP address list at:
Tools & Settings > IP Addresses (under Tools & Resources)
Some additional IPv6 addresses are configured on the server. The subnet mask is incorrectly set to /0 for the first additional IPv6 address.
Bug #PPPM-3815. It is fixed in Plesk 12.5 MU #24 and Plesk Onyx.
Install the latest microupdates or upgrade to the latest Plesk version.