FTP with SSL Problem

Job ID: 38161705

Budget: $10 – $30 USD

I have a small code in Vb.Net to read files using FTP.
In most cases, everything works fine, using passive mode and SSL.
But on some routers (which must have an advanced firewall), I get error 425 in the communication.
In these cases I have to disable SSL for it to work.
The problem is that soon the FTP server will ask for an SSL connection explicitly and these few clients will stop working.
I need to find a solution.