subdomains are not working

Hello,

Can somebody tell me why?
In my dedicated server, I have 50 webhosting accounts.
Subdomains in 40 accounts are not working, subdomains in 10 accounts are working. I am sure that the DNS are fully propagaged. What is wrong? and how can I fix it?

And want to say one more thing. in the 10 accounts where subdomain working fine, each time after I create a subdomain, the subdomain can be accessed instantly.

 

 

 

 

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