The Package Delivery component will only download one package at a time. The Package Delivery component in the Agent that is used to download packages sorts the packages based on their priority and by their package size. Higher priority smaller packages are downloaded before lower priority larger packages.
If a large package is in the process of being downloaded, and a new package which is smaller is created or needs to be downloaded, the smaller package will preempt the larger package. The download of the larger package will be aborted and it will resume after the smaller package is downloaded. This behavior is by design. Note: This applies to both http and UNC transfers.
In IIS 7 is a Request Filtering option that contains all of the denied and allowed extensions.
In the example above .resources is blocked by default and thus cannot be downloaded by IIS. Thus IIS throws a 500 internal server error.
The Requesting Filter would need to be modified to allow these extensions for http download to succeed.
Here is a scenario to show why a package may take a long time to download. A large package contains many files. Some of these files have extensions that are not allowed by IIS. The package download begins with IIS but hits a file with an extension that isn’t allowed. The download is aborted.
The package download picks back up using UNC. UNC is able to download these files that are blocked by IIS. If a smaller package needs to be downloaded. The connection to the download of the larger package is dropped so that the smaller package can be downloaded. The download to the larger package is aborted.
This sort of process can repeat itself over a long period of time before the package is successfully downloaded.
Make sure that all extensions are configured in the Request Filtering to be allowed. This will prevent problems with http downloads. Smaller packages will preempt larger packages so if a large package needs to download ASAP than postpone the creation of packages until after the larger package has completed downloading.
SMP 7.0 and 7.1
Imported Document ID: TECH166809
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