Cannot remote desktop to the file server

Hi,

For some reason i cannot remote desktop on to our File server. My self and all our users can access all file shares without any issues. That's working absolutely fine as expected. 

But I cannot remote desktop on the server. I'm getting the below error message. 

Any ideas why i can't remote desktop but can access all file shares without any issues using the same computer. Its connected on the same Network 

many thanks, 

Atheek