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Server extremely unstable

DelanoR

New Pleskian
Hello,

Our server has been extremely unstable since three days. We have this VPS now for only one month and we are transferring all our domains to it from 3 older Ensim servers.
Currently our VPS server has over 200 subscriptions and ever since it's giving loads of issues.

VPS specs
OS: Parallels Plesk Unlimited 11 + CentOS 6.3
CPU: 6 Cores
RAM: 24576MB
Hard disk: 500GB

The problems are mainly in the Nginx and httpd service, whenever we add a new subscription, change web-mail client or add a domain alias the httpd services crashes and doens't get back online untill i shut down the Nginx service. When shutting down Nginx service the httpd service magically comes back online and everything starts working again, then, i can start the Nginx also.

Also from time to time this warning comes along
Code:
New files of configuration for Apache web server were not built due to errors in configuration templates: Template processing failed: file = /usr/local/psa/admin/conf/templates/default/domainWebmail.php, error = No data.. The detailed error message was e-mailed to you, so please check the e-mail, fix the errors, and click here to retry generating broken configuration or click here to retry generating of all configurations.
It is possible to regenerate all the configs but the warning doesn't seem to go away, but at a random moment it's gone.

Also, today when we started working the server gave a 503 (service unavailable) error, when i gave the server a reset everything started working again, except for httpd en nginx.

When i check the nginx and httpd error logs nothing is in there about starting issues (only connection refused for <domain>), so where can breakdown the problems that are currently running in our server and is there prehaps an way to reset/reconfigure httpd/nginx?

Thanks in advance,
Delano
 
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