Description:
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NcFTPd server returns "250 Changed." (not 200 as many other servers):

[root@vps ~]# ftp ****.com
Connected to ****.com (64.***.***.***).
220 ****.com NcFTPd Server (licensed copy) ready.
Name (*****.com:root): ****
331 User test okay, need password.
Password:
230-You are user #1 of 20 simultaneous users allowed.
230-
230 Restricted user logged in.
Remote system type is UNIX.
Using binary mode to transfer files.
ftp> cd public_html/test345
250 "/public_html/test345" is new cwd.
ftp> ls page9.php
227 Entering Passive Mode (***,***,**,***,***,**)
150 Data connection accepted from ***.***.***.**:****; transfer starting.
-rwxr-xr-x   1 test   test       14637 Jul 28 00:06 page9.php
226 Listing completed.
ftp> chmod 777 page9.php
250 Changed.
ftp> ls page9.php
227 Entering Passive Mode (*****)
150 Data connection accepted from ****:46124; transfer starting.
-rwxrwxrwx   1 test   test       14637 Jul 28 00:06 page9.php
226 Listing completed.

Code "250" looks as valid for such operations:
250 - Requested file action okay, completed.

But ftp_chmode returns "true" only for code 200.

Test script:
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Just try ftp_chmod for any file on NcFTPd server. Permissions successfully changed but result is "false".
Not sure if any other servers returns 250, but I've tested on ncftpd-2.8.3-freebsd6.0-i386-export.tar.gz.

Expected result:
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Expect "true" for successful ftp_chmod on NcFTPd server.

Actual result:
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ftp_chmod always returns false.

As workaround:
ftp_site($connectHandler, sprintf('CHMOD %o %s', $mode, $absolutePath));