SSH connection hangs at debug1: expecting SSH2_MSG_KEX_ECDH_REPLY

[freezr]

Hi guys,

 

this is totally new, I have been always able to connect to my remote server from my Odroid-XU4 so far.

However, today I got stuck at this step:

 

OpenSSH_9.2p1 Debian-2, OpenSSL 3.0.9 30 May 2023
debug1: Reading configuration data /home/odroid/.ssh/config
debug1: /home/odroid/.ssh/config line 10: Applying options for freezr
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 *
debug1: Connecting to $REMOTE_HOST$ [$REMOTE_HOST$] port 22.
debug1: Connection established.
debug1: identity file /home/odroid/.ssh/vultr2_ed25519 type 3
debug1: identity file /home/odroid/.ssh/vultr2_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_9.2p1 Debian-2
debug1: Remote protocol version 2.0, remote software version OpenSSH_9.3 FreeBSD-20230316
debug1: compat_banner: match: OpenSSH_9.3 FreeBSD-20230316 pat OpenSSH* compat 0x04000000
debug1: Authenticating to $REMOTE_HOST$:22 as '$USER$'
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts: No such file or directory
debug1: load_hostkeys: fopen /etc/ssh/ssh_known_hosts2: No such file or directory
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: sntrup761x25519-sha512@openssh.com
debug1: kex: host key algorithm: ssh-ed25519
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by $REMOTE_HOST$ port 22

 

The majority of the solutions online involve to lower down the MTU, this solution did not work for me.

On a Devuan laptop with the same identical ./ssh/config file and same keys the ssh connection works just fine.

 

Can't understand how to fix it, thanks! 🙏

 

Odroid-XU4
Distributor ID:	Debian
Description:	Armbian 23.8.3 bookworm
Release:	12
Codename:	bookworm