سلام دوستان
چند روزی است که هیچ کدام از کاربران نمی توانند از طریق FTP به سایت خود متصل شوند
لطفا راهنمایی کنید.

خطا هنگام کانکت با CuteFTP :
کد:
STATUS:>  	[5/12/2010 7:08:49 PM] Getting listing ""...
STATUS:>  	[5/12/2010 7:08:49 PM] Resolving host name webworld.ir...
STATUS:>  	[5/12/2010 7:08:49 PM] Host name webworld.ir resolved: ip = 76.73.68.52.
STATUS:>  	[5/12/2010 7:08:49 PM] Connecting to FTP server... webworld.ir:21 (ip = 76.73.68.52)...
STATUS:>  	[5/12/2010 7:08:50 PM] Socket connected. Waiting for welcome message...
ERROR:>   	[5/12/2010 7:08:51 PM] Control connection closed.
لاگ FTP در var/log/secure :

کد:
May 12 08:40:06 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
May 12 08:45:06 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
May 12 08:50:08 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
May 12 08:51:35 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
May 12 08:55:08 srv241 last message repeated 3 times
May 12 08:59:02 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted
May 12 09:00:08 srv241 pure-ftpd: (?@?) [ERROR] Unable to switch capabilities : Operation not permitted