Hope you are doing well.
If Single Sign-On is enabled but you want to log in with user and password use the following URL :
Assuming you are using HTTPS connection.
Note: If https is not enabled, the port is 9090.
And if you are using the solution manager :
Note: If https is not enabled, the port is 19090.
More information can be found in the following resources:
[Starting the Design Studio](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/starting_virtual_dataport/starting_the_design_studio/starting_the_design_studio)
[SAML Authentication](https://community.denodo.com/docs/html/browse/8.0/en/vdp/administration/server_configuration/server_authentication/saml_authentication/saml_authentication) page of the Virtual DataPort Administration Guide.
Hope this helps!