Error Downloading: The underlying connection was closed.

So, I downloaded wyBuild and update to use for a system I am building and I was able to build and create the updates successfully, however I am unable to download the updates via wyUpdate.

Error Message:Error trying to save file: Error downloading "ftp://admin:77530340@filetransfer.ec2.hylluspartners.com/updates/MagnimbusServiceBeta/wyserver.wys": The underlying connection was closed: An unexpected error occurred on a receive.

We are able to use that same information to download via Firefox, a small C# applet, and Google Chrome. Any ideas on why this isn't working?

It sounds like your FTP server is misconfigured. Here's what I got using your website: "The server returned an address in response to the PASV command that is different than the address to which the FTP connection was made."

What server are you using (that is, the software)? Is there a reason you're not using HTTP?

We are using an Amazon EC2 instance (using what I believe is Amazon Linux AMI).

The only reason we are using an FTP server right now is because that is what we have access to. We could set up HTTP protocol (I am not sure if set up is the right terminology, but) to access the files. I will talk to the server guy and see what we can work out

Well, we cannot upload to the FTP server. We keep getting the error 553 (Cannot create file), which is just strange, as the ftp user owns the folder itself. We are struggling right now as automatic updating is our next big push, but we aren't able to do so.

It sounds like your server is misconfigured (See: EC2 FileZilla login OK but no write or delete access). Also, you might try uploading your updates using SFTP (aka SSH FTP). It's a secure protocol that is many times better than FTP.

Okay, we finally got WyUpdate working with S3 set up with http. I have to manually upload the update builds, but that is a minor consequence of using Amazon. Thanks for your help, you got us pushed in the right direction!