Cannot rename or delete files on ftp server with php -

i wrote php script locally on machine worked. when uploaded ftp server ran issues. couldn`t use rename function etc, , had change ftp_rename etc. problem can't rename or delete files php script. have tried change permissions on files , root directory without luck. can browse files, not rename or delete them. don't error messages either, file doesn't load , 500 server error if try rename or delete. suggestions?

$ftp_server = ""; $ftp_conn = ftp_connect($ftp_server) or die("could not connect $ftp_server"); $login = ftp_login($ftp_conn, "username", "password");  $files = ftp_rawlist($ftp_conn, "www/subtitlesyncer/uploads"); ftp_delete($ftp_conn, "www/subtitlesyncer/uploads/newfile.txt") if (ftp_rename($ftp_conn, "www/subtitlesyncer/uploads/newfile.txt","www/subtitlesyncer/uploads/new_file_edited.txt")) {     ... } 

i use settings, can`t error.

ini_set('display_errors',1); ini_set('display_startup_errors',1); error_reporting(-1); 

this file try edit:

-rw-r--r-- 1 <username> <username> 130782 sep 28 14:41 newfile.txt 

i did set permission on folder , subfiles , subfolders 777 (for testing), when create textfile gets 644. i've changed permissions textfile 777 aswell, still can`t delete it.

make sure file matches permission user , group owns file. if trying delete user apache in group apache file owner ftp_server in group ftp (or ant other not marching variation) have problems. also, errors in http error log particular server. there has something.