Troubleshooting Outbound FTP Access in ISA Server. The following sections describe common troubleshooting issues. Web proxy clients cannot upload to an FTP site. Symptom: Web proxy clients cannot upload to an FTP site. The following message may appear: "The folder FTP_Name is read- only because the proxy server is not set up to allow full access."Issue: When a client computer makes a request as a Web proxy client, FTP requests are passed over HTTP, and only FTP downloads are supported.
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Solution: Install Firewall Client for ISA Server software to configure the computer as a Firewall client, or configure the computer as a Secure. NAT client. For more information about client configuration, see "Internal Client Concepts in ISA Server. В 2. 00. 6" at the ISA Server Tech. Center. You may not have to remove Web proxy settings on the client. For example, a browser such as Internet Explorer will try to make a Secure.
File Transfer Protocol (FTP): frequently asked questions. Applies to Windows Vista. For example, to go to the Microsoft FTP website, type ftp.
NAT client request before making a Web proxy request. Success is dependent on the ability of the browser to resolve the FTP server name to an IP address. Web proxy clients cannot download from an FTP server using PASV mode. Symptom: Attempts by Web proxy clients to download from a PASV mode FTP server fail. Issue: By default, FTP traffic handled by Web Proxy Filter uses Active mode. Solution: Set the DWORD value Non. Passive. FTPTransfer to 0 in the registry on the ISA Server computer, which sets the mode to Passive.
Installing FTP in IIS 7. Applies To: Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Vista. Microsoft Help and Support provides support for Microsoft products. Find solutions for top issues, common problems or get support from a professional. Windows Vista; Windows XP. Using the Built-In Windows FTP Client. learn how to use the command-line FTP tool that Microsoft built in to all current. Corporate clients located in networks protected by Microsoft® Internet Security and Acceleration (ISA) Server may require access to File Transfer Protocol.
The default value is 1, indicating that Active mode is used. For information about setting this registry key, see the Microsoft Knowledge Base article 3. How to enable passive CERN FTP connections through ISA Server. В 2. 00. 0 or ISA Server.
В 2. 00. 4 Standard Edition." The registry instructions in this article also apply to ISA Server. В 2. 00. 6 and ISA Server. В 2. 00. 4 Enterprise Edition. When setting this value in ISA Server.
В 2. 00. 4, you should ensure that ISA Server. В 2. 00. 4 Service Pack.
В 2 (SP2) is installed, to avoid the issue described in Microsoft Knowledge Base article 9. Error message when ISA Server. В 2. 00. 4 Web Proxy client users try to access an external FTP site by using passive FTP functionality: 'Error Code: 5.
Proxy Error'." Note that information in this article does not apply when using the Microsoft Windows. В® command- line FTP client, which cannot be used by Web proxy clients.
In addition, the Windows command- line FTP client cannot work in Passive mode. How to ensure that FTP requests are not proxied over HTTPSymptom: Outbound FTP requests from internal clients are being proxied over HTTP and are thus read- only. Issue: FTP over HTTP is limited to read- only. Solution: If you are using Internet Explorer, you can configure the browser to access FTP servers directly. Alternatively, you can configure client computers as Secure. NAT clients, or install Firewall Client software.
ISA Server will detect these settings, and FTP traffic will be handled by the Microsoft Firewall service and will not be proxied. For information about configuring Internet Explorer to make a direct FTP request, see the section "How to enable Internet Explorer to make a request directly to the FTP server," later in this topic. How to enable Internet Explorer to make a request directly to the FTP server. Symptom: By default, Internet Explorer make a direct request to an external FTP server, instead of making the request over HTTP. Issue: You can specify a setting in Internet Explorer so that requests are made directly. Solution: Specify the appropriate setting in Internet Explorer by doing the following. To proxy an Internet Explorer FTP request.
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Start Internet Explorer. On the Tools menu, click Internet Options.
Click the Advanced tab. In the Settings list, do the following: Note that when you select the Enable folder view for FTP sites check box, Internet Explorer behaves as a standard FTP client and uses Active mode, even if the Use Passive FTP check box is enabled. How to configure Passive and Active mode in Internet Explorer.
Issue: Internet Explorer needs to be configured to use Passive or Active mode. Solution: Before configuring Passive or Active mode, it is useful to understand the implications for each mode, as follows. In Active mode, the FTP client uses a PORT command to inform the server that it should connect to a specific IP address and port, and then send the data. This requires that the firewall allows inbound access from port 2. FTP server to all high- number ports for the client. In Passive mode, the FTP client uses a PASV command to request that the server tells the client to which IP address and port it should connect to, to send and receive data. This requires that the firewall allows outbound access to all high- number TCP ports on the FTP server, and to inbound high- number TCP ports for the client.
ISA Server supports both modes. To configure Internet Explorer in Active or Passive mode, do the following. To configure Internet Explorer 7 to use Passive mode.
On the Tools menu of Internet Explorer, click Internet Options. Click the Advanced tab. In the Browsing section of the Settings list, do the following. To configure Internet Explorer 7 to use Active mode. On the Tools menu of Internet Explorer, click Internet Options. Click the Advanced tab. In the Browsing section of the Settings list, do the following: How to access an FTP site that is not anonymous using Internet Explorer.
Symptom: Internet Explorer cannot access FTP sites requiring credentials. Issue: When FTP requests are sent over HTTP for Web proxy clients, only anonymous access is allowed. To use Internet Explorer as an FTP client when an FTP server requires authentication, you must configure Internet Explorer for direct FTP access. Solution: Enable the Enable folder view for FTP sites check box in Internet Explorer. This causes Internet Explorer to prompt for credentials.
Then specify credentials in the following format: ftp: //username: password@ftp. Alternatively, configure the client as a Secure.
NAT or Firewall client and access the FTP server using an alternative FTP client. HTTP 5. 02 Proxy Error - The login request was denied. Symptom: When accessing an external FTP site that requires authentication, the following error is received: "HTTP 5. Proxy Error - The login request was denied." Issue: Web proxy normally sends anonymous authentication information to an FTP site in the first request.
If the FTP site rejects and closes the connection at the first try, this error is issued. If you monitor the FTP traffic, you will see a log entry similar to: "Port: 2. FTP failed connection attempt user: anonymous request: Get ftp: //FTPServer/."Solution: When accessing an external FTP site that requires authentication from a Web proxy client, provide credentials in the URL, in the following format: ftp: //username: password@FTPServer.
Name. This issue does not occur in the following circumstances. Secure. NAT clients or Firewall clients make the FTP request. The Enable folder view for FTP sites check box is selected in Internet Explorer. With this setting enabled, Internet Explorer sends the request directly to the FTP site if it can resolve the remote host name, ignoring browser settings. If the host name cannot be resolved, the browser is used.
Firewall client computers require the FTP access filter for outbound FTP access. Symptom: An access rule to allow Firewall client computers outbound FTP access must use the FTP access filter. Issue: Even though Firewall client computers can handle complex secondary protocols such as FTP, the FTP access filter is required. Solution: Although the FTP access filter is not required for Firewall clients to handle the complex FTP protocol, the FTP access filter defines and dynamically opens the secondary connections required for FTP. ISA Server provides a predefined FTP protocol, but the protocol definition only includes the primary connection. Permissions error message when Firewall clients access an Active mode FTP server using ISA Server 2. Symptom: Client computers running Firewall Client for ISA Server software receive an error message when accessing an external FTP server.
Clients using Internet Explorer receive the following error message: "Windows cannot access this folder. Make sure you typed the file name correctly and that you have permission to access the folder."Clients using other FTP client applications may receive the following message: "4. Can't open data connection."Issue: The problem is the handling of the TCP connection in the following circumstances.
ISA Server. В 2. 00. Firewall Client software is used. ISA Server. В 2. 00. Standard Edition is installed. When using Internet Explorer, the Enable folder view for FTP sites check box is selected. When using Internet Explorer, the Use Passive FTP check box is cleared.
Solution: Check that you have the hotfix installed that is described by the Microsoft Knowledge Base article 8. Active mode FTP client programs cannot access an FTP server from behind Internet Security and Acceleration Server. В 2. 00. 4." This hotfix is included in ISA Server.
В 2. 00. 6 and ISA Server. В 2. 00. 4 Enterprise Edition. Secure. NAT clients cannot access external FTP servers. Symptom: Computers configured as Secure. NAT clients (with their default gateway pointing directly or indirectly to the ISA Server computer for Internet access) cannot access external FTP servers.
Issue: There may be an issue with protocol definitions, access rules, or client settings. Solution: Check the following. Secure. NAT clients must be able to resolve the FTP server name themselves. Ensure that name resolution is working correctly for Secure. NAT clients. Secure. NAT clients require the FTP access filter for FTP communications.
To check that the filter is enabled, do the following. To verify that the FTP access filter is enabled. In ISA Server Management, expand the Configuration node, and then click Add- ins.
On the Application Filters tab, right- click FTP Access Filter, and then click Properties. On the General tab, ensure that Enable this filter is selected.