Websites are intermittently unavailable. Web browser shows the error immediately upon accessing a website.
Nginx or Apache service is frequently restarted, below information can be found in
INFO: Service: httpd, Action: stop
INFO: Service: httpd, Action: status
INFO: Service: httpd, Action: start
The following records can be found in
'nginx' failed protocol test [generic] at INET[203.0.113.2:80].
'nginx' trying to restart
'nginx' stop: /opt/psa/admin/bin/nginx_control
'nginx' start: /opt/psa/admin/bin/nginx_control
GENERIC: error receiving data -- Resource temporarily unavailable
'apache' failed protocol test [generic] at INET[203.0.113.2:80].
'apache' trying to restart
'apache' stop: /usr/local/psa/admin/bin/websrvmng
'apache' start: /usr/local/psa/admin/bin/websrvmng
'apache' connection passed
Nginx or Apache is being restarted by Watchdog due to the false-negative protocol test.
This is likely to happen due to the short connection timeout value.
Increase Connection timeout value for nginx in Extensions > My Extensions > Watchdog > Web Proxy Server (Nginx):
Or increase Connection timeout value for Apache in Extensions > My Extensions > Watchdog > Open > Web Server (Apache):