Dynamic Connection in FTP is not working

Hii
I have a requirement in which files will get copied from various FTP location s.The problem is my FTP servername/username and password are dynamic.
To acheive this I created a Execute SQL task in which it gives me a result set of serverip/username/password.
Then in Foreachloop container i am passing those serverip/username/password.
And in my FTP connection manager i have set dynamic connection using expression ie @serverip+":21."+@username+"."+@password.
But it is failing with error Could not connect using FTP connection manager.
And Im ensuring that the file exist at the FTP location using a CLR function.If the file exists only then the package will execute.
And also my remote location at FTP is dynamic.
And i also tried dynamically setting ServerName and UserName property of FTP connection Manager
using expressions.
Any kind of help will be highly appreciated.

Warm Regards,
Hrishikesh

Hey hii thanks for a quick reply.
I solved my problem by creating a new useraccount and password.
And its working fine now with the above process.
But the problem which i found with my previous username and password was that the password was containing a " , "(comma).
I guess it was becoz of that.
Is there any way to handle special characters in password while using expressions or is it a issue related to account credentials.
But the user i was using was having admin priviliges

hey i am just taking the result set of ExecuteSQL task in a object variable.
And in ForEachLoop--->For Each ADO enumerator im reading that object
And in paramater mapping i am storing the values in the variables .
And in the FTP connection manager im dynamically setting it using expression s