I am having exactly the same problem wih Contribute - and a quick search on the
internet shows that it's something many people are having issues with. I have
been able to connect without any problems until today. Now, it is constantly
saying 'the server is down or not accepting connections'. I have changed my
settings to reflect your advice here but to no avail. This is a relatively new
product and there seems to be no telephone number or support line for issues
like this, leaving small charities like ourselves in a real mess. Now we have
no way of updating our website, thanks to Adobe.