I am having an issue with many of our advanced clients. The client installation works ok - the PCs show the correct site code and can be added to collections, but on the client there are only 2 options under the 'Actions' tab (Machine Policy Retrieval & Evaluation Cycle and User Policy Retrieval & Evaluation Cycle), and in the SMS Console they show up as having no site code and no client installed.
I can change the cache size remotely using the right click 'SMS Tools' option, but I cannot deploy any packages to these PCs and initiating the 'Machine Policy Retrieval & Evaluation Cycle' on the client has no apparent effect. I have also used ccmclean.exe to uninstall and re-install the client with no success.
We are on SMS2003 with SP1, the active directory schema has not been extended, the client version is 2.50.4160.2000. We have around 5000 PCs at various local sites with good communication links, and about a quarter of the PCs are having this problem. We also have the subnets set up in the Network Discovery, but I am quite new to this role and any help on solving this problem would be much appreciated.