Hello,
Have been using wyBuild for many years to release patches for .net apps. But now all of a sudden I'm unable to upload the Updates as the upload is failing with error message: “Connection closed; transfer aborted. (code=426)”. Struggling with this issue since last 3 days. Please note that I am able to connect to the same server via FileZilla and upload the same files.
You'll have to look into the logs of your FTP server. Or ideally, switch to uploading using SSH-FTP (rather than the insecure FTP)