For some reason screen will not run if /var/run/screen doesn't have chmod 777

Dockerfile

@@ -27,6 +27,9 @@ RUN apt-get install -y screen
 # Create directories
 RUN mkdir -p /var/log/supervisor
 
+# Screen directory needs permission 777 to run
+chmod 777 /var/run/screen
+
 # Add configuration and scripts
 ADD piaconfig/config.ovpn /etc/openvpn/config.ovpn
 ADD piaconfig/credentials.txt /etc/openvpn/credentials.txt