Connection to Azure VM through SSH doesn't work all the way

NFoerster

3/16/24, 12:52 PM

I have a development vm setup in a private network area in Azure. Now I'm trying to connect to it via SSH and it's failing for a certain reason. I'm sure that I uploaded the correct public key to the azure VM and that the username is also correct.

vagrant@7XZRVZ2:~/.ssh/dev-vm$ ssh -vvvv -i /home/vagrant/.ssh/dev-vm/id_rsa [email protected]
OpenSSH_8.4p1 Debian-5+deb11u1, OpenSSL 1.1.1n  15 Mar 2022
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolve_canonicalize: hostname 10.242.14.6 is address
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts' -> '/home/vagrant/.ssh/known_hosts'
debug3: expanded UserKnownHostsFile '~/.ssh/known_hosts2' -> '/home/vagrant/.ssh/known_hosts2'
debug2: ssh_connect_direct
debug1: Connecting to 10.242.14.6 [10.242.14.6] port 22.
debug1: Connection established.
debug1: identity file /home/vagrant/.ssh/dev-vm/id_rsa type 0
debug1: identity file /home/vagrant/.ssh/dev-vm/id_rsa-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u1
kex_exchange_identification: Connection closed by remote host
Connection closed by 10.242.14.6 port 22

It succeeds up to Local version string..., but then after 5 or 10s there is a kex_exchange_identification: Connection closed by remote host error which I do not understand. I searched for this error but not find a solution for my problem.

I checked the sshd logs in /var/log/auth.log on the Azure VM, in case of connection from client it just tells:

Mar 20 09:28:32 azureuser sshd[15871]: Connection from 10.236.122.24 port 31852 on 10.242.14.6 port 22 rdomain ""

I have setup a FW rule for Port 22 through the intranet network, is there probably another port I need to add?

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Sam Cogan

3/17/24, 1:51 PM

Just to confirm, the client you are trying to connect from is on the same network as the VM, or one that has connectivity to that network?

NFoerster

3/20/24, 6:21 AM

Yes the host of the VM is 10.242.14.6. I'm connected to the company intranet, the IP address is 10.236.122.24. Isn't the connection fine from the logs (Connection established)?

Score:0

Server

NFoerster

3/21/24, 2:14 PM

It was for real another firewall in company intranet. I was not aware of, as I can reach the server. If you encounter the same problems, check the firewalls again.

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EN: Connection to Azure VM through SSH doesn't work all the way

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