Store does not work after OBAS upgrade. Blank page or "404 Not Found" displayed under store URL. The following error is seen in
[2015/08/19 11:57:29] [INFO]  [HSPC::API::fault] ClassDenied : Denied access from 203.0.113.2. [undef]
The store was upgraded incorrectly.
According to OBAS 4.5.3 Release Notes:
XML API is no Longer Available on Port 80 For security reasons, the connection to XML API on port 80 is no longer supported. It is possible to connect to XML API on port 443. Before upgrading to version 4.5.3, please carefully check that your store(s) and customizations do not use port 80 for API connection. Connection to port 8080 is only possible from localhost.
To make the store available please replace "http" with "https" in
HSPCOMPLETE_SERVER section of the setting.ini file of the store in question.
In case a default Plesk page is shown at the store URL, please follow the recommendations from