Help! Domain with www and without

Hello everyone,
I dont know why all my domain some time can not access when browser with www (eg: www.salanhost.com) I dont know what wrong. Please help me resolve this problem.

Sever info:

OS: Linux 7.3
Apache
mySQL
WHM/Cpanel (V.5.3 - edge 62)

Thanks in advanced

 

 

 

 

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