Know of a method to monitor transfer times for FTP, TFTP, SCP, and SFTP?
Chris Luekermann wrote a probe for FTP Response awhile back, it was uploaded to GoogleGroups, however, that site is dying and will not let me download the probe - however - I was able to download the manual and have attached it to this post.
The probe was knocked out by Chris in a pretty short time, I'm imagining it wouldn't be hard to monitor the other protocols you listed using a similar method.
There is a Training session on the http://www.nimsoft.com/support/training.php website called "Customer Connect Webinar: Creating Custom Probes." that Richard Hirst did.
He created a Perl script that monitored the responce of an FTP download and then turned it into a full blown probe (fantastic Video!). I've attached the Lab files that go along with that training session...
Retrieving data ...