phpMyAdmin addon 403 error

I have successfully installed phpMyAdmin addon to my centmin VPS. But, I cannot access its url. Result page is always 403 although I strictly followed this guide.

My "/usr/local/nginx/conf/phpmyadmin_https.conf":

Code:

location ^~ /29045_mysqladmin28978/ {
        #try_files $uri $uri/ /29045_mysqladmin28978/index.php?$args;
        include /usr/local/nginx/conf/php_29045_mysqladmin28978.conf;

        auth_basic    "Private Access";
        auth_basic_user_file  /usr/local/nginx/conf/htpassphpmyadmin;
        #allow 127.0.0.1;
        #allow ;
        #deny all;
}

 

Code:

#auth_basic    "Private Access";
#auth_basic_user_file  /usr/local/nginx/conf/htpassphpmyadmin;

Unfortunately, it did not work!
My VPS hostname is always default "corejs-tracking-test-2.novalocal" after rebooting. (I think I cannot change my hostname permanently.)
I manually set hostname to "srv1.manhhailua.com"

Code:

$ hostnamectl set-hostname srv1.manhhailua.com

Then I install/reinstall phpMyAdmin.sh but I get stuck in 403 problem.
Do you need any information else, eva?

 

The web host is my company cloud system. I'm trying to follow the provided url (Install - CentOS 7 - Hostname Changes after Reboot | Centmin Mod Community) and still not work! No idea now! :|

 

I tried this way before posting this thread and it did not work! I'm now digging in the nginx config of phpMyAdmin addon after installation.

 

My problem is still occurring. I've successfully change hostname to eg. "abc.maindomain.com". phpMyAdmin addon page still returns 403.

Here is the log from "/var/log/nginx/localhost.error.log":

Code:

2016/07/26 03:57:53 [error] 3467#0: *9 open() "/usr/local/nginx/html/21487_mysqladmin30068.gz" failed (13: Permission denied), client: 113.190.232.10, server: corejs-tracking-test-2, request: "GET /21487_mysqladmin30068 HTTP/1.1", host: "srv1.manhhailua.com"
2016/07/26 03:57:53 [error] 3467#0: *9 open() "/usr/local/nginx/html/21487_mysqladmin30068" failed (13: Permission denied), client: 113.190.232.10, server: corejs-tracking-test-2, request: "GET /21487_mysqladmin30068 HTTP/1.1", host: "srv1.manhhailua.com"
2016/07/26 03:57:53 [error] 3467#0: *9 open() "/usr/local/nginx/html/favicon.ico.gz" failed (13: Permission denied), client: 113.190.232.10, server: corejs-tracking-test-2, request: "GET /favicon.ico HTTP/1.1", host: "srv1.manhhailua.com", referrer: "http://srv1.manhhailua.com/21487_mysqladmin30068"
2016/07/26 03:57:53 [error] 3467#0: *9 open() "/usr/local/nginx/html/favicon.ico" failed (13: Permission denied), client: 113.190.232.10, server: corejs-tracking-test-2, request: "GET /favicon.ico HTTP/1.1", host: "srv1.manhhailua.com", referrer: "http://srv1.manhhailua.com/21487_mysqladmin30068"