On this page you can log in to the Excentis website itself, e.g. for access to the Participant's Portal.

If you're looking for the Excentis Support Portal, then you need to log in via https://support.excentis.com.
You will also find the ByteBlower GUI and API downloads through the Support Portal.

Go to Support Portal Login instead

Enter your Excentis username.
Enter the password that accompanies your username.