The client ssh is the SSH from Ubuntu 20.04, OpenSSH_8.2p1 Ubuntu-4ubuntu0.5, OpenSSL 1.1.1f 31 Mar 2020
Since I've seen some ssh-related changes in 7.3 and 7.4, I tried the latest minor versions from 7.1 and 7.2, but no change. Also tried to install the CHR whole disk image, also no change. Reinstalling 6.48.3 works again.
Any idea what could be happening ?
Output of ssh -v (minus some IPs and stuff):
OpenSSH_8.2p1 Ubuntu-4ubuntu0.5, OpenSSL 1.1.1f 31 Mar 2020
debug1: Reading configuration data /home/doudou/.ssh/config
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 XXXXXX.
debug1: Connection established.
debug1: identity file /home/doudou/.ssh/id_rsa type 0
debug1: identity file /home/doudou/.ssh/id_rsa-cert type -1
debug1: identity file /home/doudou/.ssh/id_dsa type -1
debug1: identity file /home/doudou/.ssh/id_dsa-cert type -1
debug1: identity file /home/doudou/.ssh/id_ecdsa type -1
debug1: identity file /home/doudou/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/doudou/.ssh/id_ecdsa_sk type -1
debug1: identity file /home/doudou/.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /home/doudou/.ssh/id_ed25519 type -1
debug1: identity file /home/doudou/.ssh/id_ed25519-cert type -1
debug1: identity file /home/doudou/.ssh/id_ed25519_sk type -1
debug1: identity file /home/doudou/.ssh/id_ed25519_sk-cert type -1
debug1: identity file /home/doudou/.ssh/id_xmss type -1
debug1: identity file /home/doudou/.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.5
debug1: Remote protocol version 2.0, remote software version ROSSSH
debug1: no match: ROSSSH
debug1: Authenticating to XXXXX
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: diffie-hellman-group-exchange-sha256
debug1: kex: host key algorithm: rsa-sha2-256
debug1: kex: server->client cipher: aes192-ctr MAC: hmac-sha2-256 compression: none
debug1: kex: client->server cipher: aes192-ctr MAC: hmac-sha2-256 compression: none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(2048<8192<8192) sent
^C