Appengine: SocketException: Cannot assign requested address on socket.connect

Question

I am using java.net.Socket.connect() to connect to an FTP server in passive mode on AppEngine. It works around 30% of the time, but I usually get the following error:

java.net.SocketException: System error: errno: 99, detail:Cannot assign requested address

It sounds as though the host simply doesn't have any available ports for outgoing connections (I am not requesting a specific port.) I get the same result when I use new java.net.Socket() I would appreciate any thoughts as to what might be happening.

Answer 1

打开用于FTP的套接字时，我遇到了很多相同的错误，但是在设置socket.setSoLinger(true, 0)和socket.setReuseAddress(true)之后，错误率降低了。