A socket operation was attempted to an unreachable host

[09:47:52] SmartFTP v2.0.999.5
[09:47:52] Resolving host name "10.1.11.6"
[09:47:52] Connecting to 10.1.11.6 Port: 21
[09:47:52] A socket operation was attempted to an unreachable host.
[09:47:52] Cannot login waiting to retry (30s)...
[09:47:52] Client closed the connection.
[09:47:52] Active Help: https://www.smartftp.com/support/kb/58



dear frndz,
this is the message i am getting when i am connecting. my os is winxp sp-2, configured with only windows firewall.
plz suggest me what the problem is all about.
bye,
thanx in advance
chikubuku.