Error when creating a new data source on Report Server

[Katebrk]

Hello!

We are trying to create a new data source on Report Server, but the following error occurs when we enter the username/password and click "Create" button: 

User name and password are correct, because when I'm trying to fill in the same username and password in other data source just to check if the connection is successful, everything works fine with this username and password:

Could please anybody tell where the problem lies or where to start looking?

Thanks!

[FarhanAhmed]

Can you please give us a more details?

What is the data source?

What is the authentication method that you are using

is an error happening for all data sources or any specific data source?

Are you able to connect the same data source using other tools from Report ServeR?