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 poi

How are you deploying these new clients?

Are they approved in the console?

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,

I just wanted to pass on my thanks for posting the fix. I had the exact same issue, your solution worked like a charm.

Thanks.

Denys