In particular, because it uses UDP, it avoids the problems that many FTP servers have had with requiring a separate process for each client, [citation needed] and because it is built to use an unreliable protocol, it can more easily[citation needed] handle resuming a transfer after a network failure.
Eventually, however, an increased use of firewalls, a decreasing usage of the shell accounts required to run a server or most of the clients, and a lack of FSP support in web browsers caused its use to taper off, and the warez scene moved to HTTP and FXP while pornography moved to publicly advertised web servers.
Because FSP uses UDP and FTP uses TCP they can both run at same time on the same port number without conflict.
In 1993, discussions were held about what to expand the acronym to; the ultimate result was File Service Protocol.
[1] Due to its inherent low performance,[citation needed] FSP was sometimes colloquially said to stand for "Fucking Slow Protocol" .