VPN your machine is not a valid computer on the domain

I have had this a few times where a user has been using VPN then all of a sudden he gets this error, Your machine in not a valid computer on the domain? How does it lose touch with the domain and how can I correct this without having the user bring the laptop back in to sync up with the domain. He is a remote user and this would require a long ride to the company.
Dennis MillerAsked:
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Ernie BeekExpertCommented:
You could check if the machine is able to connect to a DC through the VPN to keep in synch (if you haven't done so already).
This could be some error that is specific to your VPN client.  Please post more info about the connectivity part.
Dennis MillerAuthor Commented:
I was told that if the laptop has not been on the domain for over 30 days it loses sync? This guy never or very seldom comes in to the office. I myself have my laptop at home so when I am on call I do not have to bring my laptop home. This sometimes happens to me as well. I bring it back in and it syncs fine?
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Ernie BeekExpertCommented:
That's correct. Until that time it uses 'cached credentials'.
Thinking of it, it's logical. When at home, you first start the computer. Then it can't find the domain. After that you start the vpn. Not sure if the computer rechecks, assuming it can connect to a DC through the tunnel.
I vaguely remember that there are ways to resolve that. Let me think.............

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Dennis MillerAuthor Commented:
erniebeek, you are on to what I am looking for. That is the exact problem.
Dennis MillerAuthor Commented:
I was told there was a reg hack that fixes this, but no one knows what hack. Lot of good that does me. Thanks.
Ernie BeekExpertCommented:
Still thinking...............
Are you (they) using the cisco secure vpn client?
Dennis MillerAuthor Commented:
yes we are. Seems were getting close.
you could try to use lmhosts to point to your dc and your domain.
Dennis MillerAuthor Commented:
I found the reason here. It seems Trend Micro needed to be updated. This apparently allows the VPN client to run. It works. I updated TrendMicro and the VPN now works. Thanks all.
Dennis MillerAuthor Commented:
What I found was that a machine outside the office that was a remote user who had not been in side connected to the domain for over a month was not getting the Trend updates and this was throwing the laptop out of sync with the domain. If you update Trend, it will reconnect with the server and sync up all the valid info and then you can be a valid machine on the network. This waorks only after the computer says your computer is not a valid domain laptop. Thanks for all the help and I will give the points for the trying. Thanks all. My answer is the correct answer but will give the points to the guys who took the time.
Dennis MillerAuthor Commented:
I found my own answer and this is the answer that works with this specific question. Trend Micro needed to be updated when off site. This causes a resync of the domain and the computer then once updated it will then connect fine.
Ernie BeekExpertCommented:
Good catch! That's one to remember :)
Thx for the points.
Dennis MillerAuthor Commented:
Thanks for the help. This is what got me to the point of finding out that I needed to update this.
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