I've tried two FTP programs, and passive FTP is on.
Oh, and got email back from support -- the problem, as yet, remains unsolved, 'cause they couldn't replicate it.
The weird thing to me is I haven't changed any of my settings, so if it's something on my end, I don't understand why it suddenly stopped working.
Thanks for your help.
I changed some settings, and it did finally let me connect. BUT it still doesn't allow me to upload a whole file before it cuts me off mid-transfer, which was the original problem I had when I started getting the other error message.
Also, I tried another computer (same ISP, but different connection) and it also doesn't allow me to upload more than half a file to DH's server. I was afraid I might have inadvertantly messed up something on my end, but that pretty neatly rules that out. So unless my ISP (Comcast) is blocking uploads, the problem, it would seem, must be on DH's end, near as I can figure.
I'm starting to get slightly panicked, here -- I need to be able to upload information! It's for my wedding website, and people have just gotten the invitations and need to get on to get the code for hotel reservations. Not to mention the fact that the "who we are" page is completely ruined due to a half-upload, and I have no way of fixing it.
I tried connecting to a non-DH-hosted server and uploading (via the same FTP client, without changing any settings, etc.), and it worked absolutely perfectly.
I also downloaded a third FTP client "just in case" to try connecting to DH and uploading -- with no luck. DH's servers seem to be allowing me to upload half a file, and no more.