If that is the issue then you guys should modify the URLConnection in your Java API pdfcrowd.jar by increasing the connection timeout limit to be at least 60 secs for example. Since the API is responsible of creating the connection.
More specifically in com.pdfcrowd.Client.getConnection(String, String)
com.pdfcrowd.Client.getConnection(String, String) {
...
conn.setConnectTimeout(60000);
...
}