Failed to receive status information from Apache

Servicio de apache intermitente,
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Al ingresar via WHM, Home »Server Status »Apache Status, me muestra el sgte mensaje.

Failed to receive status information from Apache.
Unable to connect to local httpd server.

Desde el terminal, tengo estos errores:
grep -i maxclient /usr/local/apache/logs/error_log
[Sun Dec 16 06:39:30 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 09:59:55 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 10:11:48 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 13:02:10 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 16:50:53 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 16:53:04 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 17:13:09 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting
[Mon Dec 17 19:11:08 2018] [error] server reached MaxClients setting, consider raising the MaxClients setting

Y en mi global configuración de apache,

Server Limit (Maximum: 20,000) [?]256
Max Clients [?]150

Alguien, me pueda ayudar a resolverlo.