I can not remove folder from server

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http://serverfault.com – Accidentall I created the folder on remotely server (Server OS is Linux) using php: mkdir("folder_name",0); Now I can not delete this folder from server. I think this is from permission, because 0 is not correct permission. When I am trying delete this folder which php function rmdir(), php returns error that Unable to access on this folder. Same error obtain I, when trying change access which php's chmod() function. I can not delete folder which FTP client also. So how can I delete this folder? (HowTos)