HTTP/1.1 502 Proxy Error ( SSL port specified is not allowed

Hello!

I'm trying to connect to my personal FTP-Server from my computer at work. The only way out is to use a HTTP-Proxy. Unfortunately I can't get it to work properly, I'm always get the following error when connecting to my or any other FTP-Server (dns names have been removed from the log):




Resolving host name [not public]...



Resolving host name [not public]



Connecting to Proxy ([not public]) ->  IP: 192.168.159.15 PORT: 80



Connected to Proxy ([not public]) -> Time = 16ms



HTTP/1.1 502 Proxy Error ( SSL port specified is not allowed.  )



Cannot login waiting to retry (30s)...




Comments:
I'm tried to use normal FTP . The proxy works fine when using it with Mozila 1.6. I'm using the latest SmartFTP build (1.0.981)

regards
dex