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Using Serv-U on Microsoft ISA 2004 Server  -  KB Article #1439

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By default, Microsoft ISA Server 2004 blocks FTP access and makes its drives read-only when running an FTP server on a computer where it is installed. Configuration of the ISA server is necessary to allow clients to access Serv-U.

The following steps are taken from Microsoft's Knowledge Base.

Configure the server publishing rule. To do so:

  1. Start the ISA Server Management tool.
  2. Expand ServerName, where ServerName is the name of your ISA Server computer.
  3. Click Firewall Policy, click the Tasks tab, and then click Create a New Server Publishing Rule.
  4. Type a descriptive name for the new rule, and then click Next.
  5. In the Server IP address box, type the IP address of the ISA Server computer's internal interface, and then click Next.
  6. In the Selected protocol list, click FTP Server, and then click Next.
  7. In the Listen for requests from these networks list, click to select the External check box, click Next, and then click Finish.
  8. Click Apply to update the firewall policy, and then click OK.

Configure FTP filtering. To do so:

  1. In the ISA Server Management tool, right-click the FTP Server rule that you created, and then click Properties.
  2. Click the Traffic tab, click Filtering, and then click Configure FTP.
  3. If you want to allow uploads to your FTP site, click to clear the Read Only check box, and then click OK two times.
  4. Click Apply to update the firewall policy, and then click OK.