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Why doesn “w” or “who” on AIX 5.x show users logged in via ssh?

April 26, 2017AIx logged SSH Users

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Why doesn “w” or “who” on AIX 5.x show users logged in via ssh?

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Between AIX 4.3.3 and AIX 5.x, the format of the wtmp struct changed. This means that sshd binaries built on AIX 4.x will not correctly write wtmp entries when run on AIX 5.x. This can be fixed by simply recompiling sshd on an AIX 5.x system and using that.