I have a dedicated server with Hostgator
I run only 4 sites of which 3 are useless and only 1 site is with traffic.

I'm unable to connect via FTP, I get this message in Filezilla:
Response: 226-Options: -a -l
Response: 226 37 matches total
Error: Connection timed out
Error: Failed to retrieve directory listing

I contacted the host and they replied:
I have spoken with our datacenter to try and determine what may be going on. It turns out that you are currently saturating your servers uplink connection which is affecting other services. It appears that at this time your using 9.9Mbps of 10MBps possible. It may be in your interest to upgrade this to a 100MBps link which we can do for you for an additional $20 per month.
What does this mean ?

Thank you.