I bought the Realms subscription a week ago with four friends, and from the beginning I have been getting this error when I was 15 seconds in the world. This happened to me frequently when I used "hamachi", however I did not give it importance since it was a free application, but I find it impressive that even paying, this error still occurs (I get the bug even when closing "hamachi" completely and even after uninstalling it) . I also changed my NAT from 3 to 2, or from closed to moderate, this didn't work either. My friends at Realms have NAT 2 and they don't have any problems. I hope you can read my complaint / report soon, as I have paid to spend a good time with friends and in this way all I got was frustration and time researching in vain. Thank you