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Hi some time back I asked this question and made a lot of changes to secure my system. Now I need to make a dummy account and give ssh access of this account to a friend. But I am unable to receive any incoming ssh connections. I can ssh to any server via my computer but can not ssh to even localhost. I am sure its due to some settings I changed in a bid to make my system more secure but know I don't remember those changes.

For one, I have disabled ufw. Also there is nothing blocking any user in /etc/ssh/sshd_config or in /etc/hosts.allow or /etc/hosts.deny.

I have attached the output of ssh -v localhost here. I narrowed down the problem to debug1: SSH2_MSG_SERVICE_ACCEPT received by comparing my output with this output on a friend's computer.

Edit 1: This is the output on using ssh -vvvvvv localhost

Any help is appreciated.

Community
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Shagun Sodhani
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2 Answers2

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Try re-installing sshd with a purge:

sudo apt-get remove --purge ssh-server
sudo apt-get install ssh-server

The most probable root cause is a botched config in /etc/ssh/ssh_config. A purge would remove this file, and give you a blank slate, hopefully fixing your issue.

Nemo
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1

I just had the same issue - secured system and unable to connect with a new account. It even seems to disconnect my existing connections with a different account, after a log in attempt.

I just found out that I restricted all access to only a few configured users. The configuration is found in /etc/ssh/sshd_config:

[..]
# Authentication:
LoginGraceTime 120
PermitRootLogin no
StrictModes yes
AllowUsers username1 username2
PermitEmptyPasswords no
[..]

I only need to add the username to the "AllowUsers" rule and restart the sshd daemon.

andrew.46
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MonocroM
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