At this time, the FTP server appears to be unreachable for all accounts. When attempting to login to the FTP server, you may see the following error message being reported by the server:
421 3900 users (the maximum) are already logged in, sorry
Because the online file manager(s) also use FTP, the file managers are also unable to connect to your hosting account.
We’re still trying to get in touch with iFastNet to get more information about this issue.
I can connect to my online file manager at this time. maybe it’s fixed to me.
Hope it fixes to everyone ASAP 
would this be causing the following error I’m experiencing:
This site can’t be reached
The connection was reset.
Try:
- Checking the connection
- Checking the proxy and the firewall
- [Running Windows Network Diagnostics](javascript:diagnoseErrors())
ERR_CONNECTION_RESET
Or is this a separate error, before I pull my hair out trying to fix it…
Yes, it is working now! I can upload files.
FTP error again?
Yes… Getting stuck when upload files
I can’t login again…
Neither me. Welp 
I think it works now! I can upload files
The FTP service appears to have come back online on 10:00 UTC this morning. There were a few more interruptions between 13:30 and 14:00, but everything seems to be OK now.
It’s working for me too