SSH between nodes no longer working after version 7 upgrade

[Charlie B]

I recently upgraded from version 6.x to version 7. after the upgrade everything appears to have gone okay and I can SSH into the host machines from my workstation. what is broken is trying to SSH between nodes.
I have tried the following things.
disabling the firewall
restarting the SSHD service.

I have confirmed the following
is listening on port 22
I can connect to it from my workstation
I can connect to the node from itself.

by accident I discovered that if I do a clean install of the node SSH works again. this is not an option however
any help I can get would be greatly appreciated. thank you for your time

 

[vesalius]

One of my nodes lost the ability to migrate VMs and complained of SSH issues between nodes. In the end this is what I found searching this forum that fixed the issue on that node.

cd /root/.ssh
mv id_rsa id_rsa.old
mv id_rsa.pub id_rsa.pub.old
mv config config.old
pvecm updatecerts