SSH connection failing from ubuntu machine to power vsi

[ashwinik30]

Hi @kavya498 , @jaywcarman

Problem Description:
Trying to connect to power vsi from ubuntu 22.04 machine is failing
Running a simple-vm-power-vs create.yml playbook and can see creation od vsi is successfull
when wait_for_connection stage is trying to connect the newly created vsi it fails to connect with error timed out

But when we use the some workarounds like reducing MTU to 1500 => 1100 and ciphering flag ctr-128 it able to cnnect locally from cli

manually workaround tried by reducing MTU
First reducing MTU

Second using cipher flag

issue details

TASK [Save new Power VSI fact] *************************************************
ok: [localhost]

TASK [Print Public IP Address] *************************************************
ok: [localhost] => {
    "pi_instance.addresses[0].external_ip": "163.68.64.77"
}

TASK [Add VSI to Ansible inventory] ********************************************
changed: [localhost]

PLAY [Connect to VSI] **********************************************************

TASK [Wait for VSI to become reachable over SSH] *******************************
**fatal: [163.68.64.77]: FAILED! => {"changed": false, "elapsed": 606, "msg": "timed out waiting for ping module test: Failed to connect to the host via ssh: Connection closed by 163.68.64.77 port 22"}**

PLAY RECAP *********************************************************************
163.68.64.77               : ok=0    changed=0    unreachable=0    failed=1    skipped=0    rescued=0    ignored=0
localhost                  : ok=14   changed=3    unreachable=0    failed=0    skipped=4    rescued=0    ignored=0

ubuntu@acs-jammy-x86:~/ansible-collection-ibm/examples/simple-vm-power-vs$

OS description :
ubuntu@acs-jammy-x86:~/ansible-collection-ibm/examples/simple-vm-power-vs$ cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04.1 LTS"
NAME="Ubuntu"
VERSION_ID="22.04"
VERSION="22.04.1 LTS (Jammy Jellyfish)"
VERSION_CODENAME=jammy
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=jammy

[jaywcarman]

I don't think this has anything to do with these Ansible modules.

My guess is that your problem lies within the network path from your ubuntu host and the AIX VM. Something (firewall, router, etc?) doesn't like the larger packets resulting from higher MTU or longer cipher key length.