We have users constantly complaining about how slow sftp is when uploading or downloading to our SFTP server via the Internet. Internally it is fine. We have tested other download / upload speeds and the bandwidth seems fine. It it just when users try uploading from or to our SFTP server from the Internet when we seem to get poor performance. I don't see how the ISP could or would limit bandwidth for ports 21 and 22. It doesn't make sense. Traffic does traverse our Checkpoint firewall for both internal and external connections to the server. So it is hard to say it is the firewall when internally we have no issue. This is the only service we are receiving complaints on and I am just looking for any input as to how to either fix this or where we can start looking. I was planning on calling our ISP however I wanted to gather as much information as I could first. We have a 20 mb fiber connection to the Internet and from what I understand this is 100mb burstable.