Comment 8 for bug 1874257

Hello Lucas,

Thanks for taking this up. Yes I can provide you the required information.

Why I believe this is a bug, is due to using putty there were no issues.

So ssh client is causing the issue. For fixing reducing the MTU of VPN tunnel interface fixed the issue.

So I think there is still a problem with ssh client with negotiating the SSH communication.

===
$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

$cat /etc/ssh/ssh_config

# This is the ssh client system-wide configuration file. See
# ssh_config(5) for more information. This file provides defaults for
# users, and the values can be changed in per-user configuration files
# or on the command line.

# Configuration data is parsed as follows:
# 1. command line options
# 2. user-specific file
# 3. system-wide file
# Any configuration value is only changed the first time it is set.
# Thus, host-specific definitions should be at the beginning of the
# configuration file, and defaults at the end.

# Site-wide defaults for some commonly used options. For a comprehensive
# list of available options, their meanings and defaults, please see the
# ssh_config(5) man page.

Host *
# ForwardAgent no
# ForwardX11 no
# ForwardX11Trusted yes
# RhostsRSAAuthentication no
# RSAAuthentication yes
# PasswordAuthentication yes
# HostbasedAuthentication no
# GSSAPIAuthentication no
# GSSAPIDelegateCredentials no
# GSSAPIKeyExchange no
# GSSAPITrustDNS no
# BatchMode no
# CheckHostIP yes
# AddressFamily any
# ConnectTimeout 0
# StrictHostKeyChecking ask
# IdentityFile ~/.ssh/identity
# IdentityFile ~/.ssh/id_rsa
# IdentityFile ~/.ssh/id_dsa
# IdentityFile ~/.ssh/id_ecdsa
# IdentityFile ~/.ssh/id_ed25519
# Port 22
# Protocol 2
# Cipher 3des
# Ciphers aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128,aes128-cbc,3des-cbc
# MACs hmac-md5,hmac-sha1,<email address hidden>,hmac-ripemd160
# EscapeChar ~
# Tunnel no
# TunnelDevice any:any
# PermitLocalCommand no
# VisualHostKey no
# ProxyCommand ssh -q -W %h:%p gateway.example.com
# RekeyLimit 1G 1h
    SendEnv LANG LC_*
    HashKnownHosts yes
    GSSAPIAuthentication yes
    GSSAPIDelegateCredentials no
ForwardX11Trusted yes
ForwardX11Timeout 596h

For VPN client connection we are using open-connect, so usually connect via
$sudo openconnect <domain-name>

$dpkg -l | grep openconnect
ii libopenconnect5:amd64 7.06-2build2 amd64 open client for Cisco AnyConnect VPN - shared library
ii openconnect 7.06-2build2 amd64 open client for Cisco AnyConnect VPN

I'm marking this bug status to confirmed.

Thanks
Jay