After updating SSH on client-side

iMac:~ Luca$ ssh -V OpenSSH_7.3p1, OpenSSL 1.0.2j 26 Sep 2016 iMac:~ Luca$ ssh -p 53 -D 9999 luca@myIP luca@myIP's password: luca@ns3274305:~$ ssh_dispatch_run_fatal: Connection to myIP port 53: message authentication code incorrect iMac:~ Luca$ ssh -o macs=hmac-sha1 -p 53 -D 9999 luca@myIP luca@myIP's password: luca@ns3274305:~$ ssh_dispatch_run_fatal: Connection to myIP port 53: message authentication code incorrect iMac:~ Luca$ 

Error I see sometime

luca@myServer:~$ Bad packet length 3045540078.

padding error: need -1249427218 block 8 mod 6

ssh_dispatch_run_fatal: Connection to 5.39.88.21: message authentication code incorrect

Server ssh -o macs=hmac-sha1 -v -p 53 -D 9999 luca@myServer when crash happens

iMac:~ Luca$ ssh -o macs=hmac-sha1 -v -p 53 -D 9999 luca@myIP // [...] luca@myServer:~$ debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 3: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 4: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 5: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 6: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 7: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 8: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 9: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 10: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 11: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 12: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 13: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 14: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 15: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 16: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 17: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 18: new [dynamic-tcpip] debug1: Connection to port 9999 forwarding to socks port 0 requested. debug1: channel 19: new [dynamic-tcpip] ssh_dispatch_run_fatal: Connection to myIP : message authentication code incorrect iMac:~ Luca$ 

APPENDIX

Server ssh -Q mac##

luca@myServer:~$ ssh -Q mac hmac-sha1 hmac-sha1-96 hmac-sha2-256 hmac-sha2-512 hmac-md5 hmac-md5-96 hmac-ripemd160 [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]

Computer ssh -Q mac##

iMac:~ Luca$ ssh -Q mac hmac-sha1 hmac-sha1-96 hmac-sha2-256 hmac-sha2-512 hmac-md5 hmac-md5-96 hmac-ripemd160 [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected] [email protected]

Server ssh -v -p 53 -D 9999 luca@myIP

iMac:~ Luca$ ssh -v -p 53 -D 9999 luca@myIP OpenSSH_6.9p1, LibreSSL 2.1.8 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 21: Applying options for * debug1: Connecting to myIP [myIP] port 53. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /Users/Luca/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.9 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.7p1 Debian-5+deb8u3 debug1: match: OpenSSH_6.7p1 Debian-5+deb8u3 pat OpenSSH* compat 0x04000000 debug1: Authenticating to myIP:53 as 'luca' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client [email protected] <implicit> none debug1: kex: client->server [email protected] <implicit> none debug1: expecting SSH2_MSG_KEX_ECDH_REPLY debug1: Server host key: ecdsa-sha2-nistp256 SHA256:DUAAYL1r0QUDtRI89JozTTz+bm5wcg4cOSaFaRdbr/Y debug1: Host '[myIP]:53' is known and matches the ECDSA host key. debug1: Found key in /Users/Luca/.ssh/known_hosts:1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,password debug1: Next authentication method: publickey debug1: Trying private key: /Users/Luca/.ssh/id_rsa debug1: Trying private key: /Users/Luca/.ssh/id_dsa debug1: Trying private key: /Users/Luca/.ssh/id_ecdsa debug1: Trying private key: /Users/Luca/.ssh/id_ed25519 debug1: Next authentication method: password luca@myIP's password: debug1: Authentication succeeded (password). Authenticated to myIP ([myIP]:53). debug1: Local connections to LOCALHOST:9999 forwarded to remote address socks:0 debug1: Local forwarding listening on ::1 port 9999. debug1: channel 0: new [port listener] debug1: Local forwarding listening on 127.0.0.1 port 9999. debug1: channel 1: new [port listener] debug1: channel 2: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = fr_FR.UTF-8 Debian GNU/Linux 8.6 Linux <server> #1 SMP Tue Mar 18 14:48:24 CET 2014 x86_64 GNU/Linux server : 274305 hostname : myServer eth0 IPv4 : myIPv4 eth0 IPv6 : myIPv6 Last login: Thu Dec 8 15:36:09 2016 from XXX.XXX.XXX.XXX luca@myServer:~$