Cygwin Screen and SSH: Utmp slot not found -> not removed
It looks the culprit is the file /var/run/utmp, which in my case is just an empty file, and the only one in the /var/run/ directory.
For me I just removed it, via rm /var/run/utmp,
Or you can rename it, e.g. mv /var/run/utmp /var/run/utmp~
The answer by ryenus did not work for me. I tried renaming it, removing it, even tried touching /var/run/utmp and chmod'ing it to 0777. However I did find an answer on another forums that did work.
Simply edit your .screenrc file and add this line:
deflogin off