CompatibilityFlags

Configure the CompatibilityFlags registry value to control advanced Content Distribution behaviors, including Dynamic Block Size, hash validation, HTTPS downloads, Microsoft Update integration, and peer-to-peer compatibility settings. This reference explains supported bit flags, default values, installer properties, and troubleshooting options for optimizing Content Distribution performance and reliability in enterprise environments.

Registry value	Default value	Notes	Installer property
CompatibilityFlags	0x1E18000A (504889354)	For Content Distribution in full OS, the REG_DWORD registry value is set to the sum of the values for the required bits. The default value combines the following settings: Bit 1 - 0x00000002 enable longer values for hashes. Bit 3 - 0x00000008 fix wrong IPs in election messages. Bit 19 - 0x00080000 enable full hash generation for SIS content on DPs. Bit 20 - 0x00100000 abort download on the Content Distribution client if an LsZ has mismatch is detected. Bit 25 - 0x02000000 turn off Dynamic Block Size. Bit 26 - 0x04000000 enable download of Windows 10 Express File Updates. Bit 27 - 0x08000000 enable download of Software Updates (including Windows 10 feature updates) from Microsoft Update - see note. Bit 28 - 0x10000000 enable support for byte-range downloads (e.g. Office 365 or delta content for updates) from Microsoft Update - see note. First bit is bit 0. The default in binary is: ‭0001 1110 0001 1000 0000 0000 0000 1010‬‬ Support for downloading updates from Microsoft Update Setting bits 27 and/or 28 will enable Content Distribution to download content from Microsoft Update if the update has been deployed with Configuration Manager and the option If software updates are not available on distribution point in current, neighbor or site boundary, download content from Microsoft Update has been enabled on the Download Settings tab of the deployment. Content Distribution will not be used to download updates from Microsoft Update if the update is requested outside of a Configuration Manager Software Update Deployment (e.g. when using Windows Update for Business).	MODULE.NOMAD.COMPATIBILITYFLAGS
0x00100002 (1048578)	For the task sequence action Install and configure Nomad in Windows PE, the registry value is set to the sum of the values for the required bits. The default value combines the following settings: Bit 1 - 0x00000002 enable longer values for hashes Bit 20 - 0x00100000 abort download on the Content Distribution client if an LsZ has mismatch is detected Bit 1 - 0x00000002 (Enable longer values for hashes) is mandatory.
	The installer property must be set to sum of the values for the required bits, and given in decimal notation. For example, the following installer command-line uses: Default- 0x1E18000A Bit 0 - 0x00000001 never check hashes of downloaded content. Bit 17 - 0x00020000 disable DelegatedLSZ checks and errors. Sum - 0x1E1A000B (505020427). Copy `> msiexec /i 1E.Client-x64.msi MODULE.NOMAD.COMPATIBILITYFLAGS=505020427 [other properties] /qn`

Registry value

Default value

Notes

Installer property

CompatibilityFlags

0x1E18000A (504889354)

For Content Distribution in full OS, the REG_DWORD registry value is set to the sum of the values for the required bits.

The default value combines the following settings:

Bit 1 - 0x00000002 enable longer values for hashes.
Bit 3 - 0x00000008 fix wrong IPs in election messages.
Bit 19 - 0x00080000 enable full hash generation for SIS content on DPs.
Bit 20 - 0x00100000 abort download on the Content Distribution client if an LsZ has mismatch is detected.
Bit 25 - 0x02000000 turn off Dynamic Block Size.
Bit 26 - 0x04000000 enable download of Windows 10 Express File Updates.
Bit 27 - 0x08000000 enable download of Software Updates (including Windows 10 feature updates) from Microsoft Update - see note.
Bit 28 - 0x10000000 enable support for byte-range downloads (e.g. Office 365 or delta content for updates) from Microsoft Update - see note.

First bit is bit 0. The default in binary is: ‭0001 1110 0001 1000 0000 0000 0000 1010‬‬

Support for downloading updates from Microsoft Update

Setting bits 27 and/or 28 will enable Content Distribution to download content from Microsoft Update if the update has been deployed with Configuration Manager and the option If software updates are not available on distribution point in current, neighbor or site boundary, download content from Microsoft Update has been enabled on the Download Settings tab of the deployment. Content Distribution will not be used to download updates from Microsoft Update if the update is requested outside of a Configuration Manager Software Update Deployment (e.g. when using Windows Update for Business).

MODULE.NOMAD.COMPATIBILITYFLAGS

0x00100002 (1048578)

For the task sequence action Install and configure Nomad in Windows PE, the registry value is set to the sum of the values for the required bits.

The default value combines the following settings:

Bit 1 - 0x00000002 enable longer values for hashes
Bit 20 - 0x00100000 abort download on the Content Distribution client if an LsZ has mismatch is detected

Bit 1 - 0x00000002 (Enable longer values for hashes) is mandatory.

The installer property must be set to sum of the values for the required bits, and given in decimal notation. For example, the following installer command-line uses:

Default- 0x1E18000A
Bit 0 - 0x00000001 never check hashes of downloaded content.
Bit 17 - 0x00020000 disable DelegatedLSZ checks and errors.
Sum - 0x1E1A000B (505020427).

Copy

> msiexec /i 1E.Client-x64.msi MODULE.NOMAD.COMPATIBILITYFLAGS=505020427 [other properties] /qn

Bit	Hex	Decimal	Description
0	0x0001	1	Never check hashes of downloaded content.
1	0x0002	2	Enable longer values for hashes. This value is auto-enabled when the Configuration Manager client is detected. You must manually configure this setting on any DP that does not have the Configuration Manager client installed.
2	0x0004	4	Calculate CRCs as files are downloading.
3	0x0008	8	Fix wrong IPs in election messages. On multi-homed machines sometimes the IP from a wrong adapter can get sent in the election messages resulting in peers failing to connect to the master. Enabling this flag causes Content Distribution to correct such IPs at the time when messages are received and thus prevent master connectivity issues.
4	0x0010	16	Determines compatibility with Content Distribution v3.x caches. Set this option once all Content Distribution v3.x installations have been upgraded.
5	0x0020	32	Disable all RDC data generation.
6	0x0040	64	Keep Packages that failed the CRC test during P2P or download from DP.
7	0x0080	128	Prevent computers using wireless connections from becoming fill-in multicast masters.
8	0x0100	256	Include LinkLocal IPv4 addresses.
9	0x0200	512	Include LinkLocal IPv6 addresses.
11	0x0800	2048	RESERVED
12	0x1000	4096	Do not automatically jump from HTTP to HTTPS during download from DP.
13	0x2000	8192	Always use HTTPS. (Use this setting when Configuration Manager is configured to use HTTPS-only communication for downloading content from Distribution Points)
14	0x4000	16384	RESERVED
15	0x8000	32768	RESERVED
16	0x00010000	65536	RESERVED (this flag is no longer used; previously this flag disabled a workaround for the issue described in IIS Request Filtering)
17	0x00020000	131072	Disable DelegatedLSZ checks and errors.
18	0x00040000	262144	Disable partial download when App-V streaming, i.e. download entire application.
19	0x00080000	524288	Enable full hash generation for SIS content when an LsZ file is generated on a DP. If this is not enabled, SIS content is trusted, and corrupted content may be downloaded. Enabled by default.
20	0x00100000	1048576	Abort download on the Content Distribution client if an LsZ hash mismatch is detected. If this is not set, when a Content Distribution client detects a hash mismatch it will re-request LsZ generation on the DP then try again, and get stuck in a loop if the SIS content is corrupt. Must be set on clients if Bit 19 is set on DPs. Enabled by default.
25	0x02000000	33554432	Turn off Dynamic Block Size. This flag is set by default, which means Dynamic Block Size is disabled by default.
26	0x04000000	67108864	Enable download of Windows 10 Express update files. Enabled by default.
27	0x08000000	134217728	Enable download of full file software updates from Microsoft Update when deployed through Configuration Manager (see Support for downloading updates from Microsoft Update). Enabled by default.
28	0x10000000	268435456	Enable download of byte-range software updates (e.g. Express updates, O365 updates) from Microsoft Update when deployed through Configuration Manager >(see Support for downloading updates from Microsoft Update ). Enabled by default.
30	0x40000000	1073741824	Enable SoftwareUpdate metadata validation. This is not enabled by default. It can be used to resolve rare issues related to SoftwareUpdates where the contents could be updated without any change in its ID or version.