The nebula-storage service failed to start, the storage logs show that the port is occupied, but I checked that port 9780 is not occupied either. Also the configuration files are original and unmodified.
There could be several reasons why the nebula-storage service is failing to start:
Another process is already using port 9780. You can use the lsof -i tcp:9780 command to check which process is using the port.
There is a problem with the nebula-storage service itself. You can try restarting the service.