I took the latest beta version of your software (FFXP 1.4.1 Build 829) because your
  official version did not wanted to work with my ISP proxy. As I saw,
  this version does not want to work with proxy too

 My ISP uses
  Squid 2.4 as HTTP proxy, and I can't connect to ftp servers through
  this proxy with FlashFXP. CuteFTP works without any problems. You've
  did great ftp client and I like it very much. Can you help me to
  ressolve this problem? Thanks in advance.
  Here you go status messages:
  
Connecting to ftp.btv.lt via Proxy  #7
Connected to Proxy proxy.takas.lt Port 8080
<HTML><HEAD>
<TITLE>ERROR: The requested URL could not be retrieved</TITLE>
</HEAD><BODY>
<H1>ERROR</H1>
<H2>The requested URL could not be retrieved</H2>
<HR>
<P>
While trying to retrieve the URL:
<A HREF="ftp.btv.lt:21">ftp.btv.lt:21</A>
<P>
The following error was encountered:
<UL>
<LI>
<STRONG>
Access Denied.
</STRONG>
<P>
Access control configuration prevents your request from
being allowed at this time.  Please contact your service provider if
you feel this is incorrect.
</UL>
<P>Your cache administrator is <A HREF="mailto:webmaster@takas.lt">webmaster@takas.l  t</A>. 
<br clear="all">
<hr noshade size=1>
Generated Sat, 12 Jan 2002 10:58:57 GMT by proxy.takas.lt (Squid/2.4.STABLE3)
</BODY></HTML>