Can't Coect To Ftp Server

I tried coecting ftp server using both active and passive mode even behind router and direct coection, none worked. I tried disabling firewall,AV still nothing is helping.

Status: Resolving address of kandlalogistics.com

Status: Coecting to 198.15.81.91:21...

Status: Coection established, waiting for welcome message...

Response: 220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------

Response: 220-You are user number 1 of 50 allowed.

Response: 220-Local time is now 19:56. Server port: 21.

Response: 220-This is a private system - No anonymous login

Response: 220-IPv6 coections are also welcome on this server.

Response: 220 You will be discoected after 15 minutes of inactivity.

Command: AUTH TLS

Error: Could not coect to server

Please help..