Unable to connect to RDP of Web Role

Hi everyone,

I have had a lot of Web Role for my project.
I have been able to connect to all Web Role via RDP.
However, I couldn't suddenly connect to several Web Role via RDP from 1/20/2014.

When I tried to connect RDP port(3389) via some tools, the port didn't be opened.
This was not firewall problem in my office becasue when I tried to connect RDP port from other Web Role to the Web Role, I saw the same situation.

Can you tell me how to fix this problem?


Thank you,
Hongbum