RSTS API cannot be reached through this port. Contact your system administrator (4377851)

When trying to configure Web Interface to SAML2.0 authentication, the following error is returned.

"RSTS API cannot be reached through this port. Contact your system administrator"

OR

"API cannot be configured due to incorrect port number"

RSTS misconfigured or configuration is broken.

1 - Backup the existing Active Roles Configuration DB;

2 - Uninstall rSTS by running the following prompt cmdlet Rsts.exe /uninstall connect as administrator;

Note: Make sure the terminal is opened to the following folder path C:\Program Files\One Identity\Active Roles\8.2\Web\RSTS

3 - Open Active Roles MMC as Active Roles Admin and click View | Mode | Raw Mode;

4 - Expand Configuration | Application Configuration | Web Interface and delete the EDS-WI-FederatedAuthentication-Configuration file type called 820 Rsts Configuration;

6 - Open the registry editor (regedit) and navigate to the following path Computer\HKEY_LOCAL_MACHINE\SOFTWARE\One Identity\Active Roles\Configuration\Web

7 - Set the key IsRstsConfigured as 0;

5 - Install rSTS by running the following prompt cmdlet Rsts.exe /install;

6 - Open Active Roles Configuration Certer | Web Interface | Authentication and configure the Web Interface sites with SAML2.0;