Opencart vs CentOS - help needed

Hello everyone.
I hope somebody can help me with this problem. Before I used Opencart on Ubuntu but after I moved into a new server (CentOS 7.0) there is a lot of problems and it just won't work properly.
For example I can't have an access from other software like Odoo for example, my connector won't work (Webkul), actually it works only one way Opencart => Odoo but doeasn't work Odoo => Opencart.
My support is alreado over so I don't want to ask them for help anymore. Had already a lot of problems to execute basic support (3 months).
So if anyone meet similar problem or have more experience with CentOS than I have ... I'll be appreciated.