Whether your RU5 clients are getting updates?
How do you defined GUP ?(single,multiple)
Troubleshooting the Group Update Provider (GUP) in Symantec Endpoint Protection
 

Another strange fact is this - looking at the SEPM console, i see that the "not updated clients" have:

virus definitions 31-12-2009
truscan definitions 20-01-2010
ips definitions 19-01-2010

?

Have you configured a Single GUP or Multiple GUP.

In case its a single GUP try using the multiple option and check whether it helps. You can crate a test group move in 1 or 2 clients and apply the multiple GUP policy and check.

@AravindKM

GUP get updates from SEPM, no problems.
Clients get updates from their location's GUP, still no problem except the faulty location of course.
GUPs are single for each site.

@sandip_sali: this group must contain both clients and GUP or i can leave the GUP in their default locations?

Are you sure that ther has been no change in the Group Policy?

Check that also.

I am using 11.0.5002.333 with 20 GUP.  All are working fine, except for the fact that my 31-12-2009 issue is still pending.  The patch is not getting installed.

Leonard

Leonard, what do you mean with your post regarding policy? What i should check exactly?

Also, the definitions on the GUP might be damaged.
This might be the reason that it hasn't updated.

Try this -
Deleted the LiveUpdate store:
C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate\Downloads

Delete the the numbered folders in the following directory:
C:\Program Files\Common Files\Symantec Shared\VirusDefs

Try to to update the the GUP box by using the update command in the SEPM
Clients>Group>Right click on GUP box>Run Command on Client>Update Content

Mike

I have experienced that a restart of the client (GUP) needs to be done, before it updated the date on AV def.

Everything tried yesterday, both the solution from postechgeek and the restart as suggested by Viper5.
No result.

What i'm trying now - i'm moving the client to a group with a LU policy that tell them to update directly from SEPM, just to keep them updated. It's working.
Tomorrow, when all the clients will be updated i'll move them back to the normal group - i mean the faulty one - and then see if they start to speek corectly with their GUP.

I'll let you know if it works.

@ Paglia

That's a good idea. I hope it works for you.

Mike

Can you assign another computer from that group as GUP ? 

I have attached a couple of screen shots above, just check it out.

SOLVED! :)

I moved all the pcs and servers of the faulty group to a new group. Maybe ther was a fault with policies - anyway after this change everything ok!