Yeah Dan, thanks for chiming in. In particular that would be at least (but not lmited to) the changes:
8.04 Rework DTLS MTU detection. (#10) 7.08 Support automatic DTLS MTU detection with OpenSSL. 7.07 Automatic DTLS MTU detection. Ubuntu has these newer versions. Bionic 18.04 is on 7.08 and the most recent LTS Focal is at 8.05. The current development release is at the latest 8.09 of openconnect. These are new features added in 7.07 and 7.08 - IMHO they do not qualify for a SRU release into Xenial [1] - especially since you can "get away" with a config change that mitigates the issue. [1]: https://wiki.ubuntu.com/StableReleaseUpdates ** Also affects: openssh (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: linux (Ubuntu Xenial) Importance: Undecided Status: New ** Also affects: openconnect (Ubuntu Xenial) Importance: Undecided Status: New ** No longer affects: linux (Ubuntu Xenial) ** No longer affects: openssh (Ubuntu Xenial) ** Changed in: openssh (Ubuntu) Status: Confirmed => Invalid ** Changed in: openconnect (Ubuntu Xenial) Status: New => Confirmed ** Changed in: openconnect (Ubuntu) Status: Confirmed => Fix Released ** Changed in: openconnect (Ubuntu Xenial) Importance: Undecided => Wishlist -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/1874257 Title: SSH fails with connection timed out - in VPN and hangs here "expecting SSH2_MSG_KEX_ECDH_REPLY" + Ubuntu 16.04.6 LTS Status in linux package in Ubuntu: Invalid Status in openconnect package in Ubuntu: Fix Released Status in openssh package in Ubuntu: Invalid Status in openconnect source package in Xenial: Confirmed Bug description: Hello Team, SSH timeout issue, once connect to VPN. Environment ====== Dell XPS 9570 Ubuntu 16.04.6 Xenial Xerus) kernel - 4.15.0-55-generic $dpkg -l | grep -i openssh ii openssh-client 1:7.2p2-4ubuntu2.8 --> ii openssh-server 1:7.2p2-4ubuntu2.8 ii openssh-sftp-server 1:7.2p2-4ubuntu2.8 VPN tunnel info ==== vpn0 Link encap:UNSPEC HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00 inet addr:IP P-t-P:xx Mask:255.255.252.0 inet6 addr: fe80::b8e2:bea4:2e62:fe08/64 Scope:Link UP POINTOPOINT RUNNING NOARP MULTICAST MTU:1406 Metric:1 RX packets:962 errors:0 dropped:0 overruns:0 frame:0 TX packets:1029 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:500 RX bytes:87839 (87.8 KB) TX bytes:238740 (238.7 KB) Issue ==== Unable to connect to any host via ssh or sftp after VPN connection Tried ===== Reinstalled the openssh-client package and still no luck. May I know why the default cipher is not taking/hanging? Please let me know . There were no recent changes. Workaround === Able to connect to ssh / sftp $ssh -c aes128-ctr user@IP Below is the debug ssh client logs === ====== $ssh -vvv user@ip OpenSSH_7.2p2 Ubuntu-4ubuntu2.8, OpenSSL 1.0.2g 1 Mar 2016 debug1: Reading configuration data /etc/ssh/ssh_config debug1: /etc/ssh/ssh_config line 19: Applying options for * debug2: resolving "IP" port 22 debug2: ssh_connect_direct: needpriv 0 debug1: Connecting to IP [IP] port 22. debug1: Connection established. debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_rsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_rsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_dsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_dsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_ecdsa type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_ecdsa-cert type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_ed25519 type -1 debug1: key_load_public: No such file or directory debug1: identity file /home/user/.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_7.2p2 Ubuntu-4ubuntu2.8 debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.3 pat OpenSSH* compat 0x04000000 debug2: fd 3 setting O_NONBLOCK debug1: Authenticating to IP:22 as 'user' debug3: send packet: type 20 debug1: SSH2_MSG_KEXINIT sent debug3: receive packet: type 20 debug1: SSH2_MSG_KEXINIT received debug2: local client KEXINIT proposal debug2: KEX algorithms: curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,ext-info-c debug2: host key algorithms: ecdsa-sha2-nistp256-cert-...@openssh.com,ecdsa-sha2-nistp384-cert-...@openssh.com,ecdsa-sha2-nistp521-cert-...@openssh.com,ssh-ed25519-cert-...@openssh.com,ssh-rsa-cert-...@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa debug2: ciphers ctos: chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: ciphers stoc: chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com,aes128-cbc,aes192-cbc,aes256-cbc,3des-cbc debug2: MACs ctos: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,z...@openssh.com,zlib debug2: compression stoc: none,z...@openssh.com,zlib debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug2: peer server KEXINIT proposal debug2: KEX algorithms: curve25519-sha256,curve25519-sha...@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1 debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519 debug2: ciphers ctos: chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com debug2: ciphers stoc: chacha20-poly1...@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-...@openssh.com,aes256-...@openssh.com debug2: MACs ctos: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: MACs stoc: umac-64-...@openssh.com,umac-128-...@openssh.com,hmac-sha2-256-...@openssh.com,hmac-sha2-512-...@openssh.com,hmac-sha1-...@openssh.com,umac...@openssh.com,umac-...@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1 debug2: compression ctos: none,z...@openssh.com debug2: compression stoc: none,z...@openssh.com debug2: languages ctos: debug2: languages stoc: debug2: first_kex_follows 0 debug2: reserved 0 debug1: kex: algorithm: curve25519-sha...@libssh.org debug1: kex: host key algorithm: ecdsa-sha2-nistp256 debug1: kex: server->client cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none debug1: kex: client->server cipher: chacha20-poly1...@openssh.com MAC: <implicit> compression: none debug3: send packet: type 30 debug1: expecting SSH2_MSG_KEX_ECDH_REPLY << Hangs here >> Please shed some views Thanks Jay To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1874257/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
