Why does lftp does not work with special characters in password?

Why lftp -u testuser,":abcd[S\ymefgH" -e "cd;bye" server1 does not work but when using ftp server1 manually it works I tried single quotes as well but it just stucks on **cd `~' [Delaying before reconnect: 28]** It is a problem only with some passwords with special characters not all of them.I am not sure which character is causing this, i believe it could be : causing the problem.