Does Google App Engine support ftp?

Question

Now I use my own Java FTP program to ftp objects from my PC to my ISP\'s website server.

I want to use Google App Engine\'s servlet to get Paypal IPN messages, then

Answer 1

You can use the Apache Commons FTP client (org.apache.commons.net.ftp.FTPClient) if you put it into passive mode. Just do the following:

    FTPClient client = new FTPClient();
    client.connect(FTP_HOST);
    client.enterLocalPassiveMode();

Then it won't call ServerSocketFactory, and life should be good!