Problems with permissions on sockets.

[Arne Munch-Ellingsen]

Last night something weird happend on one of our Unix machines (a Sun
3/60 running SunOs 4.0.3) :

The permissons on the device files /dev/kmem and /dev/mem was changed
from 644 to 640. This resulted in that users running programs opening
and reading either kmem or mem complained about it not working. At the
same time users started complaining about that rsh and rlogin was not
working properly. The following error message occured:

rcmd: socket: Permission denied

Does anyone know what this means, and how to fix it? Has anyone
experienced this happening on their machines, and what is causing it?

Help needed!