In an old PC running SCO 5.0.4, I can not ping any node including
itself. But this machine can be pinged by others.

I don't know if this related or not. But after reboot, teh following
error appears:
"Fatal error - Failed to set key combination for toggling focus when in
inRoot mode.
Some otehr application has already grabbed key combination.
Check focusToggle resource."

Any one know how to check "focusToggle" resource?
Is this problem relate to not being able to ping?