Spike,   the machine will always have an account in the AD Realm.
So no, you do not have to leave and re-join. What DOES time out is the password.
sssd should renew the password periodcially (*) when it is running. As
you say you have had > 30 days of downtime

You can use the msktutil  to reset a password
https://fuhm.net/software/msktutil/manpage.html#PASSWORD EXPIRY

(*) you can change this periddicity in sssd - and can turn it down to
a very shirt time, for debugging.
One of the parameters is also 'how soon after startup should I look at
the age of the password









On Mon, 8 Oct 2018 at 15:16, Spike White <[email protected]> wrote:
>
> All,
>
> I had a VM down for a great number of days.  Apparently, it was not 30 days.  
> Because even though it initially didn't correct do AD authentication, I fixed 
> one misconfiguration in /etc/krb5.conf, restarted SSSD and it did.
>
> But that raises a bigger question.  If it's been >30 days and my machine 
> account is no longer valid, how do I rejoin the domain?
>
> Is it:
>    realm leave (no flags)
>    readlm join (with all my usual flags that I use on the initial realm join)
>
> Spike
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