Switching from the OA Control Panel to BA does not work - after clicking the 'Billing' link in the OA Control Panel, the session ends and one of the following sympoms is observed:
- BA login page is displayed instead of actual login - duplicated OA right frame instead of BA page - exception "Error occurred on attempt to initialize Billing Manager CP (https://url) session: Session ID was not found in response from Billing Manager. Please check password is correct."
The following error message is logged in the
No root access granted for this address
The IP address of the OA server (control panel/management node/branding) is absent in the ip_access.db file on the BA Application server.
Put IP addresses of all OA UI and Branding servers into the ip_access.db file on the BA Application server to make it possible to log in to BA with the common password from these IPs:
C:\Program Files\Parallels\PBA\conf\ip_access.db(this is the default path, it may be changed on a specific installation)
ssm restart pba
Add the IP address to the special section  in the ip_access.db file.
Use the proper format of records in the file, like this(please make sure that there is no space after true):
 192.168.1.101 = true
Refer to the documentation for more details.