Sccm 2012 Only two actions on cleints actions can not find any errors

Question

We have deployed sccm 2012 sp1 with cu2
everything was working ok then it all suddenly it stopped working  for new client's . The client installs ok but there are only two action in on the client actions. Clients find the site code ok and logs look ok as far as we can tell
We did move are dns from windows hosted dns to a third part appliance around the same time but all cleitns still have vlid dns entries . the managmeopt point is still in the underscore records in dns 
we have checked ClientLocation.log, LocationServices.log, ClientIDManagerStartup.log and ccmexec.log  and there are no errors we can see.
the sccm console reports all services as green
We are running with PKi all certs are still valid and new clients are still receiving  valid certficates
any ideas or pointers?
Rick Cross

Answer 1

Hi we fixed this this in the end by this incase its any help to any one else
look in the MP_Policy.log on the site server
see if you have any these errors
Detected at least one row in the result set from PolicyAssignment table which does not have a Signature, rejecting all rows.
if so connect to the sql server and run this sql
run this check
SELECT * FROM ResPolicyMap WHERE machineid = 0 and PADBID IN (SELECT PADBID FROM PolicyAssignment WHERE BodyHash IS NULL)
if any errors found run this
To delete:
Delete FROM ResPolicyMap WHERE machineid = 0 and PADBID IN (SELECT PADBID FROM PolicyAssignment WHERE BodyHash IS NULL)
then rerun check
as per this
http://social.technet.microsoft.com/Forums/en-US/cfbfdc2a-81b7-4b69-948b-361f5d66515e/sudden-issue-with-client-communications-in-sccm-2012?forum=configmanagerosd
Rick Cross