Cannot able to Connect SSAS cube With power bi Still having access to the cube

Hi Guys,

       I am connecting the cube live to create a report in power bi. i was able to connect the cube till yesterday but to day i cannot able to connect the cube and it shows an error like "We cannot connect the analysis services server because the connection is timeout or the server name is incorrect" I have also checked the access in the Rolessection an i am having it. But i dont know why the issue is araising.