I set up my server (also my domain controller) to be an FTP server and initially this was working fine (for 1+ years). Now it's not working and my "upload" program that I use from my clients computers doesn't even get past the InternetConnect function (program is written in C-language). The error returned is 12111, which seems to have a lot of causes so I'm not sure how helpful the error code number is. I have to assume that I have inadvertently set some of my FTP authentication settings incorrectly on my server under IIS (7.5). Any ideas?