Policy
Alternative Port Mappings
This policy setting determines the alternative port registry mappings used by the SMB client. If you enable this policy setting, the first valid mapping will be used if the mapping's server name matches the targeted server name for connectivity. If you enable this policy setting and do not specify at least one valid mapping, or if you disable or do not configure this policy setting, then the SMB client will refer to other methods of determining alternative port usage such as with the NET USE or New-SmbMapping commands. Examples: contososa.file.core.windows.net:tcp:448 edgesrv1.corp.contoso.com:quic:450 How to modify this setting: Arrange the desired alternative port mappings in the edit box with one mapping entry per line. The format of each mapping entry specifies a server name, transport type, and port number separated by colons as done so in the example above. Note: This policy does not require a Windows reboot to take effect.
e1633fc773f9 Pol_AlternativePortMappings Registry
Copy registry mappings
HKLM\Software\Policies\Microsoft\Windows\LanmanWorkstation\AlternativePortMappingsPolicy notes
This policy setting determines the alternative port registry mappings used by the SMB client. If you enable this policy setting, the first valid mapping will be used if the mapping's server name matches the targeted server name for connectivity. If you enable this policy setting and do not specify at least one valid mapping, or if you disable or do not configure this policy setting, then the SMB client will refer to other methods of determining alternative port usage such as with the NET USE or New-SmbMapping commands. Examples: contososa.file.core.windows.net:tcp:448 edgesrv1.corp.contoso.com:quic:450 How to modify this setting: Arrange the desired alternative port mappings in the edit box with one mapping entry per line. The format of each mapping entry specifies a server name, transport type, and port number separated by colons as done so in the example above. Note: This policy does not require a Windows reboot to take effect.