In the course of an update to firmware 21.0.X an error occurs in PLCnext Control. This error prevents the activation of licenses on the PLCnext Control. Error identification 1: In PLCnext Store a license activation is not executed correctly. The activation process showes „WAITING_FOR_DEVICE“ longer than 1 minute. In the Store device view, „processing“ is permanently displayed at the license. The license is not transferred to the device. Error identification 2: Use your browser and open the WBM of the device by entering the IP address. The following error message appears: 
Error identification 3: Use your browser and open the WBM of the device by entering the IP address. In the WBM, navigate to the Administration → License Management location. Here the situation is as follows: 
Cause of „Query failed“ situation : The write permissions for the folder „Config“ are not set correctly. You can fix this error as follows: Recommended procedure: - Perform a type 1 reset. It is best to use the PLCnext Engineer for this. Afterwards a license activation is possible again. License activations already scheduled in the store will finish. Hint: The IP address is then again default 192.168.1.10 Your project is deleted. The store service is deactivated Your regtoken must be renewed. ( Proficloud.NET → My Appliances → select correct UUID → Press „Reset Regtoken“ ) Procedure 1 without a type 1 reset (Not recommended) : - Creating the root user with the comand with Putty >> sudo passwd root - delete the User-config folder with Putty. Use root rights (>> su -) >> rm /media/rfs/rw/upperdir/opt/plcnext/config/ -r - Exit root User and Lock the root User >> sudo passwd -l root - Reboot the device. >> reboot Procedure 2 without a type 1 reset (Not recommended) : - Creating the root user with the comand with Putty >> sudo passwd root - Change access permissions for SSH - Option 1: Change the line „#PermitRootLogin yes“ to „PermitRootLogin yes“ in the file /etc/ssh/sshd_config - Option 2: Use the following command alternatively to the file change >> sed -i „/#PermitRootLogin/s/^#//“ /etc/ssh/sshd_config && /etc/init.d/sshd restart - Use winSCP to copy all elements from „/media/rfs/ro/opt/plcnext/config“ to „/opt/plcnext/config“. - Exit root User and Lock the root User >> sudo passwd -l root - Reboot the device.