FTP folder error

I’ve already sent off the tech support e-mail to my hosting service, but wondered if it was something simple that everyone here might know (maybe a Windows thing?).

The error lists:

220 – …Pure-FTPd [TLS]
220 – …user number 1 0f 50 allowed
220 – …server port: 21
421 – unable to set up secure anonymous FTP

The site is fine and I can manage through admin.

Thanks for any help.

– H.