Installer framework online installer can't log into repository over ftp

[Hertzy]

I'm trying to create an online installer for my application. Currently the configuration file I'm using looks like this:

<?xml version="1.0" encoding="UTF-8"?>
<Installer>
    <Name>Application title</Name>
    <Version>0.9.0</Version>
    <Title>Title</Title>
    <Publisher>Me</Publisher>
    <StartMenuDir>Fysiapp</StartMenuDir>
	<RunProgram>@TargetDir@/some.exe</RunProgram>
    <TargetDir>@ApplicationsDir@/somedirectory</TargetDir>
	<RemoteRepositories>
     <Repository>
             <Url>ftp://[repository url]/repository</Url>
             <Enabled>1</Enabled>
             <Username>[my username]</Username>
             <Password>[my password]</Password>
             <DisplayName>Example repository</DisplayName>
     </Repository>
</RemoteRepositories>
</Installer>

When I execute the installer, it keeps throwing up the login dialog, telling me "you need to supply a username and password to access this site [repository url]". Inputting any of the usernames and passwords with which I have managed to log in to my ftp server doesn't help. Cancelling stops the install with the message "authentication failed".

How should I go about solving this?

[koahnig]

@Hertzy

This is quite an old post. Nevertheless in case someone encounters the same or similar issues.

In my case https://forum.qt.io/topic/93676/using-qtifw-with-ftp the syntax of ftp urls including user name and password helped.