No shell access?

[Jesse Adelman]

Hello, good SSH users and developers. I need to set up SSH such that users
can scp and sftp but NOT log in to a shell. I've attempted to set a shell as
/bin/<doesnotexist>, but that breaks SSH generally, including scp and sftp.
What is the best/preferred method for disabling shell access and allowing
scp and sftp to work?

Systems used: RH Linux, Solaris 8

Thanks in advance,

Jesse Adelman
Sr. Systems Engineer
Denalii, Inc.