Yes. Using right now emphasizes the time and implies that some condition is currently being experienced that prevents the connection but with the expectation that it will be corrected at some point in the future.
We can't connect right now, but hopefully it will be fixed in an hour.
Using just now may imply that some general condition has changed that is not temporal in nature:
You asked me to disconnect that cable, but I can't connect to Outlook now.
or it might be used in the exact same way as right now albeit with perhaps a little less emphasis on this exact moment.