Quote:
Originally Posted by tekjunky
If it is your permissions are fine, remove the "test" line and save the file again.
If it isn't you have a permissions issue.
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... or a disk-space or disk usage quota issue in your .ssh directory. This prevents ssh from appending onto known_hosts, and (naturally) it will fail utterly silently.
Why someone didn't build a disk-space / quota space
hard error message into the kernel I have no idea.

This has cost me more time than any other problem with 'nix, since diskspace problems cross into almost every functional border in unix and, well, *any* static os.