WordPress site or some pages or subdirectories are unavailable with error:
CONFIG_TEXT: 503 Service Temporarily Unavailable
- Following error can be found in
CONFIG_TEXT: [Wed Nov 29 16:04:30.284405 2017] [proxy_fcgi:error] [pid 53999] [client 203.0.113.2:63871] AH01067: Failed to read FastCGI headerOR in
[Wed Nov 29 16:04:30.284437 2017] [proxy_fcgi:error] [pid 53999] (104)Connection reset by peer: [client 203.0.113.2:63871] AH01075: Error dispatching request to :
# tail -fn0 /var/log/plesk-php71-fpm/error.log
[29-Nov-2017 15:46:18] WARNING: [pool example.com] child 50974 exited on signal 11 (SIGSEGV - core dumped) after 0.943055 seconds from start
- Website is working if all WordPress plugins are disabled:
Domains > example.com > click on Wordpress instance name > Manage Plugins.
- Site can work if another PHP version is used for domain (Domains > example.com > PHP Settings )
The plugin is incompatible with PHP version used for the domain.
Disable plugin one by one to determine what plugin is a cause of the issue. Try to upgrade all plugins. Plugins can be disabled and upgraded at Domains > example.com > click on Wordpress instance name > Manage Plugins