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But I am getting the following error:

ssh_exchange_identification: read: Connection reset by peer

I executing the following command:

sudo ssh root@example.net

Can this be due to somekind of firewall settings or because the server is overlaoded?

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You don't need to sudo to ssh to another box as root, just ssh root@where-ever from your current id. You only need sudo if you're using key exchange as the root user. Also, never ssh into a box as root. Having said all that - try ssh -v -v -v root@whatever and see if you get any meaningful output (-v makes it more verbose). – EightBitTony Jun 29 '11 at 19:14
Have you specifically enabled root logins over SSH? I know they're disabled in Ubuntu, and you really shouldn't be logging in as root via SSH anyways. – Darth Android Jun 29 '11 at 19:21
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migrated from stackoverflow.com Jun 29 '11 at 19:08

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2 Answers

up vote 2 down vote

It's likely a firewall issue, I can connect fine from here (it asks me for a password).

Please do not use sudo ssh, just ssh is fine. Also, disable passwordbased authentication and use keybased auth if possible.

To diagnose problems, run ssh with the -v option (-vvv for maximum verbosity):

ssh -vvv user@host
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up vote 0 down vote
  • try ssh -vvv
  • (re)moving your .ssh/config to let's say /tmp and try ssh again
  • try regenerating your keys (client then server)
  • try to ssh from same box to same box just for test
  • temporary disable your firewall
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