1st issue is that the 4215 is not supported by IPS 6.1.
IPS 6.0 is the last version for support of the 4215.
(New 6.0 Service Packs, Engine Updates, and Signatures are still being created, and these can be used on the 4215).
However, that doesn't explain your download problem. You should have received an error that the 4215 is not supported, and not a "Connect failed" error. So something else must be wrong.
Have you tried FTPing from a different machine to your FTP server to verify that the username and password you entered are correct?
Also check to see what directory you have to "cd" to in order to see the file.
If you have a TFTP-Root directory on your ftp server it is possible that the ftp connection to your server may put you directly in TFPT-Root from the start. In which case you would not need to specify the directory. And your upgrade command could be:
ftp://user@198.233.24.205/IPS-K9-6.1-1-E2.pkg
If all else fails use the "packet capture FastEthernet0/0" command in a separate CLI connetion to capture the packets for the ftp upgrade. Then download the file and look at it with a program like WireShark. You can see what the error is that is being returned from your FTP server.
