I did see the error for the upload_url last night. Changing it to my server name allows the upload to complete, but the file does not appear on the server and no entry is made in the database for the attachment.
However, using the server name is not a viable solution for me, since some of our developers must be able to access the bug tracking server from outside the LAN.
I have been trying to follow the direction in the forum at http://swfupload.org/forum/generaldiscussion/1183 but have not any success with the suggestions there.
Is there any way to work around this? Can I use some other method to upload a file that accepts Windows SAM authentication?