Parameters

When sending instant messages, users can attach files and send them to the other participants in the conversation. Lync Server 2010 can be configured so that files with certain extensions--typically extensions of file types that could potentially prove harmful--are not allowed to be sent from the client.

The ability of users to transfer files using Lync Server 2010 clients is determined by the file transfer filter configuration settings applied at the global or (optionally) the site scopes. The Set-CsFileTransferFilterConfiguration cmdlet allows you to modify an existing file transfer filter configuration. You can modify the list of extensions that will be blocked by adding or removing extensions, or by creating a new list altogether. You can also use this cmdlet to change whether or not file transfer filtering is enabled, and at what level (block only the files with extensions matching those in the Extensions list, or block all files).

Who can run this cmdlet: By default, members of the following groups are authorized to run the Set-CsFileTransferFilterConfiguration cmdlet locally: RTCUniversalServerAdmins. To return a list of all the role-based access control (RBAC) roles this cmdlet has been assigned to (including any custom RBAC roles you have created yourself), run the following command from the Windows PowerShell prompt:

Get-CsAdminRole | Where-Object {$_.Cmdlets –match "Set-CsFileTransferFilterConfiguration"}

Microsoft.Rtc.Management.WritableConfig.Settings.ImFilter.FileTransferFilterConfiguration object. Accepts pipelined input of file transfer filter configuration objects.

This cmdlet does not return a value or object. Instead, the cmdlet configures instances of the Microsoft.Rtc.Management.WritableConfig.Settings.ImFilter.FileTransferFilterConfiguration object.

-------------------------- Example 1 --------------------------

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Set-CsFileTransferFilterConfiguration -Identity site:Redmond -Enabled $False

The command shown in Example 1 disables file transfer filtering for the Redmond site (that is, the file transfer filtering configuration that has the Identity site:Redmond). To carry out this task, the Enabled parameter is included in the command and is set to $False.

-------------------------- Example 2 --------------------------

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Set-CsFileTransferFilterConfiguration -Identity site:Redmond -Extensions @{Add=".ps1"}

The preceding commands adds a new file extension (.ps1, the file extension for Windows PowerShell scripts) to the list of file extensions prohibited in the Redmond site. To add the new file extension, Set-CsFileTransferFilterConfiguration uses the Extensions parameter and the Add list modifier. The modifier adds the specified file extension--.ps1--to the list of prohibited extensions. To add multiple extensions by using a single command, simply separate the file extensions using commas: @{Add=".ps1",".ps2",".ps3"}. Note that you must include the period when specifying a file extension.

-------------------------- Example 3 --------------------------

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Get-CsFileTransferFilterConfiguration | Set-CsFileTransferFilterConfiguration -Extensions @{Add=".ps1"}

In Example 3, the .ps1 file extension is added to the Extensions list of all the file transfer filter configurations currently in use in the organization. To do this, Get-CsFileTransferFilterConfiguration is first called, without any additional parameters, in order to return a collection of all the file transfer filter configurations currently in use. That collection is then piped to Set-CsFileTransferFilterConfiguration, which adds the .ps1 file extension to each item in the collection.

-------------------------- Example 4 --------------------------

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Set-CsFileTransferFilterConfiguration -Identity site:Redmond -Extensions @{Remove=".ps1"}

In the preceding example, the file extension .ps1 is removed from the list of extensions blocked by the file transfer filter configuration for the Redmond site. This example is identical to Example 3 except that, instead of calling the Add list modifier to add an extension to the list, the Remove list modifier is called to remove an extension from that list.

-------------------------- Example 5 --------------------------

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$a = Get-CsFileTransferFilterConfiguration -Identity site:Redmond $a.Extensions.Remove(".ps1") Set-CsFileTransferFilterConfiguration -Instance $a

Example 5 performs the same action as Example 4: it removes the .ps1 extension from the list of file transfer filter extensions for the Redmond site. However, in this case we first retrieve the file transfer filter configuration for site:Redmond and assign the output to the variable $a; $a now contains the configuration for the Redmond site. Next, we retrieve the Extensions property of $a, which is the Extensions property of site:Redmond ($a.Extensions). This property contains the list of file extensions. Following the Extensions property is a call to the Remove method ($a.Extensions.Remove). We pass the value .ps1 to the Remove method; this will remove that extension from the list in the Extensions property. However, this has removed the extension only from the configuration stored in memory in the variable $a. To make the change to the database, we need to call Set-CsFileTransferFilterConfiguration, passing $a to the Instance parameter.

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