Winscp giving error for delete, move etc

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http://unix.stackexchange.com – I can login via winscp to my server I can move around the folder but when I try to delete or even download or upload files it keep showing me this error. General failure (server should provide error description). Error code: 4 Error message from server: Failure Request code: 3 I tried this command df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 112G 47G 60G 44% / /dev/sda1 99M 37M 57M 40% /boot tmpfs 3.0G 0 3.0G 0% /dev/shm (HowTos)