Resetting pw from `virsh list --all`

So I was given this machine and ti said it's a KVM hypervisor hosting 2 non critical vm. That's all, no other info.

So naturally, I would do virsh list --all. Apparently, it ask me for auth name and pw which I don't have, and the guy before me disappeared. So here's my question, how can I reset the pw? also how can I make it the next time I do any virsh command it will not ask for user and pw?

(I am running as root)

[root@quartz ~]# virsh list --all Please enter your authentication name: root Please enter your password: error: Failed to reconnect to the hypervisor error: no valid connection error: authentication failed: authentication failed 

Thanks