Hello.
i got this error when i was try to upload my website : Error: Connection timed out
Error: Could not connect to server , via FTP filezilla flashfxp etc .
the solution is :
FIRST:
Go to the website https://app.infinityfree.net and select your domain and click on 
edit account button
SECOND:
Click on hosting account password and change it
Do not use the same password of infinytifree and only use words and numbers
FINAL:
In the ftp client put the info with the new password
https://i.ibb.co/9s2W9cb/1.png and now u are in the ftp options
