MS Proxy refuses connection

Hi!

When I try to connect to any ftp server on the internet, SmartFTP fails to connect trough the MS Proxy.

If SmartFTP is configured to support SOCKS4a then this happens:

Resolving host name w2kproxy...
Resolving host name ftp.suse.com...
Connecting to Proxy (w2kproxy) -> IP: 172.26.45.37 PORT: 80
Connected to Proxy (w2kproxy) -> Time = 0ms
SOCKS5: Got no response from firewall. Session aborted.
Cannot login waiting to retry (30s)...
Connection closed.


And if configured to support SOCKS5 then:

Resolving host name w2kproxy...
Resolving host name ftp.suse.com...
Connecting to Proxy (w2kproxy) -> IP: 172.26.45.37 PORT: 80
Connected to Proxy (w2kproxy) -> Time = 0ms
SOCKS5: Got no response from firewall. Session aborted.
Cannot login waiting to retry (30s)...
Connection closed.


Does anybody have a hint ?

Thank you.

some problem...
OS - WinXP SP2
proxy - Wingate 5
SFTP version - latest (1.0.985)

Proxy with enabled for "Everyone" rights on to SOCKS5 and disabled timeouts.
SFTP - passive mode (with active mode same results).