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[Laurens DeHaan <2051255@xxxxxxxxxxxxxxxxxx>]

Hello,

Please scratch this bug report. Likely cause was some weirdness with
pfSense firewall configuration when using an IPv6 tunnel broker. My
apologies.

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https://bugs.launchpad.net/bugs/2051255

Title:
  SSHD fails when Vmware Ubuntu server guest has 6 vCPUs

Status in ubuntu-docs package in Ubuntu:
  New

Bug description:
  Guest configuration:
  Intel CPU: E5-2640 v4, 10GB VMDK, 20GB RAM, no swap, vmnet3 driver connected to internal NIC of pfSense 2.7 firewall, Ubuntu server 22.04.3 LTS, OpenSSH server 1:8.9p1-3ubuntu0.6 500. Connection via Hurricane Electric IPv6 tunnel broker to server in Miami, Fl. IPv6 ICMP packets pass without problems.

  ESXi host: Dell PowerEdge R630, 128GB, Active-Active NICs for Internet
  connection

  SSH Client: Remmina 1.4.29, using one-character password or ex25199
  SSL certificate.

  Expectation: Connecting to the guest machine after command: ssh -vvvvv
  <username>@<servername>.eastlakeventures.club

  Results:

  With 6 vCPUs:

  Connection failed with last output of "debug3: set_sock_tos: set
  socket 3 IPV6_TCLASS 0x10"

  With 4 vCPUs:

  Result after above "debug3" message: "debug1: Connection established
  and active console access.

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