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Change permissions on file /etc/passwd on 640, then chmod o-r . After that, i can't login on server on ssh. Putty says "Network error: Software caused connection abort".

What problems? And how i can fix this...

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What problems? Basically, you broke it.

If you have console access, boot from a rescue image - and change the permissions on /etc/passwd back to what they're supposed to be.

  • But what wrong in 640 /etc/passwd? – John Smith Nov 18 '16 at 10:42
  • @PhilippCrux Most likely the login process can't read the file to determine if the account you're trying to log in with exists. – Andrew Henle Nov 18 '16 at 10:43
  • It's weird, i think. All users can see /etc/passwd - it is not secure.. – John Smith Nov 18 '16 at 11:27
  • @PhilippCrux What's not secure about it? Account names aren't secret. – Andrew Henle Nov 18 '16 at 11:31
  • You're supposed to be able to read /etc/passwd. It's for user information. Passwords are stored in /etc/shadow. – Spooler Nov 18 '16 at 12:13

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