Honestly i don't know mate. It's not something they really covered but they usually tell everyone via a company wide email if anything changes which affects any customers any way and blocking ports or any ports never was mentioned. But personally i don't think they do. Are you accessing your webserver from the intranet or internet? As in using world wide web to access and upload files via FTP or are you doing this on your WAN? Intranet?
Well he's already said the port was open on scans so it wasn't an ISP issue.