After upgrading or after a fresh installation, when agents/client machines attempt to request a new policy configuration nothing happens, even when they should receive a new configuration due to a policy change or software update made available etc.
An examination of the local agent logs are showing a warning similar to the following:
RequestPolicies failed: Unexpected response from URL http://NSserver/Altiris/NS/Agent/GetClientPolicies.aspx: Host Resource 491a9e63-6072-445d-b366-1d583ae59397 was blacklisted from receiving policies. Member of 40ae9358-6b46-42e4-9928-693f8f76f1cf collection. (-2147213300)
A close examination of a profiler trace taken from the Notification Server may show an exception code error when filtered on the category "Altiris.Web.NS.Agent" and sub category "GetClientPolicies"
exceptionCode: -532459699
ITMS 7.x, 8.x
The computers were somehow added to the Blacklisted Host Computers filter and the NS was rejecting their requests.
It is not known how the computers ended up in the filter.
Test to see if the agent computers can receive a response to a configuration update request.