I see this is a common problem but I'm new to FFXIV as of 3 months ago and this is the first time I'm encountering this. Same modem, did all the things I've read all over the internet and nothing works. I don't really want to complete delete and reinstall the game but I'm about to that point. I get this error:

Unable to download patch files: [11003][20402][19901][2]

This happens instantly, there is no download attempted. I'm not sure if this is where I submit a "support ticket" or not.