New clients are unable to download packages, the error that is being seen in the logs is:
<Description: Get 'http://server.domain.com/Altiris/PS/getpackagesnapshot.asp?PackageId=5e30c5da-4789-4d86-8b95-10574bf95eca#5E30C5DA-4789-4D86-8B95-10574BF95ECA&compress=1' failed: HTTP Request Failed: The operation completed successfully. (0)
Description: HTTP Request Failed: The operation completed successfully. (0)
Description: Download Snapshot failed: HTTP Request Failed: The operation completed successfully. (-2147352567)
Here it was found that the code was unable to handle the backslash character, '\', on the end of the parameters parsed for the altiris agents install path at time of installation. It did not however affect functionality in any way until it came time to install the Package Server agent on that client where the Local Path configured in IIS would break all web access to the GetPackageSnapshot.asp on that package servers stopping the clients from pulling down the packages.
This error can also be caused if Active Server Pages has not been installed as an IIS component via 'Add/Remove Programs'.
Download SP3 KB34317 Update (R6) from: http://www.solutionsam.com/solutions/6_0/Altiris_NS_6_0_SP3_KB34317.exe
Release notes can be found at: https://kb.altiris.com/article.asp?article=34317&p=1
NS 6.0 SP3 R2 and most likely prior and later releases of NS.