为什么用psftp可以登录，用cuteftp就不行？

delete1

我的主机RH9（Linux zw-linux 2.4.21-15.EL #1 Thu Apr 22 00:27:41 EDT 2004 i686 i686 i386 GNU/Linux）
，我在win下用putty，psftp登录使用正常，但是用cuteftp时，报如下错误：
STATUS:>;          Resolving host name 192.168.25.46.
STATUS:>;          Host name 192.168.25.46 resolved: ip = 192.168.25.46.
STATUS:>;          Getting listing ""...
STATUS:>;          Connecting to sftp server 192.168.25.46:22 (ip = 192.168.25.46)...
ERROR:>;           A timeout occurred.
ERROR:>;           Can't connect to 192.168.25.46:22. Socket error = #-1.

但是，我用cuteftp连接另外一台主机却很正常。
STATUS:>;          Resolving host name 172.16.100.51.
STATUS:>;          Host name 172.16.100.51 resolved: ip = 172.16.100.51.
STATUS:>;          Getting listing ""...
STATUS:>;          Connecting to sftp server 172.16.100.51:22 (ip = 172.16.100.51)...
STATUS:>;          Getting working directory...
STATUS:>;          Home directory: /root
STATUS:>;          Connected successfully.
STATUS:>;          Getting listing for directory '/root'...
STATUS:>;          Getting working directory...
STATUS:>;          Transfer complete.

不知问题出在哪里？
请DX指点迷津。
谢谢！