website without www is 404

[adamhk0]

Thanks for your reply.
I am hosting multiple domains on my server.
Each domain has a user account.
All of the domains setting are the same.
I tried the dns same setting on one of the domain, it works properly.

For the domain that does not work properly, I have the following setting for the dns.
At my domain resister nameservers are ns1.mydomain.com and ns2.mydomain.com.
Both ns1.mydomain.com and ns2.mydomain.com are pointed to the same ip.

At Sentora DNS Manager, I created dns records.
It pretty much is default.
For A record
I have
Host Name: @, mail, ns1, ns2
TTL: 3600, 86400, 17280, 17280.
Target: my VPS IP.

For CName
Host Name: www, ftp, subdomains.
TTL: 3600, 3600, 86400
Target: @, @, @

For the exactly same setting, it works on my other domains.

For the Vhost, I never touch it.
I have issue with one of the user account, not the zadmin account or zadmin domain.