well actually
if you look at the error message you got
(stripped of HTML)
--------------
Connecting to ftp.btv.lt via Proxy #7
Connected to Proxy proxy.takas.lt Port 8080
ERROR: The requested URL could not be retrieved
ERROR
The requested URL could not be retrieved
While trying to retrieve the URL:
ftp.btv.lt:21
The following error was encountered:
Access Denied.
Access control configuration prevents your request from
being allowed at this time. Please contact your service provider if
you feel this is incorrect.
Your cache administrator is
webmaster@takas.lt
Generated Sat, 12 Jan 2002 10:58:57 GMT by proxy.takas.lt (Squid/2.4.STABLE3)
--------------
to me that says your squid proxy
DENIED you