ftpupload.net is not down for me. If ftpupload.net is not working for you, try connecting with ftp.epizy.com instead or directly with the ip address 185.27.134.11 as the hostname.
You wouldn’t belive how many times this happens to me because my ISP keep blocking and unblocking FTPupload (and I keep forgetting to save my changed config in filezilla)
did a check, apparently it was the 9.9.9.9 and 1.1.1.1 DNS domains that were blocking it, reverted to local and it works…I trusted cloudflare and Quad9, now i won’t…
Quad9 by default does security filtering in their DNS resolver, so I’m not surprised there. Cloudflare on the other hand should not have this issue, they don’t filter the DNS results as far as I know.
A quick check from my end tells me that ftpupload.net can be resolved through 1.1.1.1 but not through 9.9.9.9. Quad9’s blocklist checker says that it’s blocked too, so that’s something to contact them about: Blocked Domain Tester | Quad9