SUMMARY: Restricted secure shells

My problem was with remote users who had restricted shells. When logging in
via ssh, they could not access the $HOME/.ssh directory.

The problem lay with me for believing my fellow sysad. A single user had
tried to modify his ssh identity files using 'cat >>' and had failed. Moral:
never believe what the user tells you.

Thanks to lieven.marchand@just.fgov.be, jj2195@sbc.com, tmwilkin@mail.com,
  francisco.monserrat@rediris.es and foster@dim.ucsd.edu, for some useful
  information.

Hector