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Ftp Access Error Code 502 Proxy Error

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trying to list files in a FTP session behind Forefront TMG 2010 ★★★★★★★★★★★★★★★ Yuri Diogenes [MSFT]March 16, 201014 0 0 0 Consider a scenario where you have a client

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workstation behind Forefront TMG 2010 and you are trying to download files from a proxy error chrome FTP Server. You are successfully able to logon on the FTP but after type the command “dir” you get the

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error message below: The message is pretty clear about what is going on, isn’t it? Well, it is but where do I enable this option? I don’t remember having this on ISA!! To https://support.microsoft.com/en-us/kb/925880 address this issue you just need to enable a new option that we have on TMG, this option is located on the FTP Filter properties as shown below: After enabling this option and apply the changes you should be able to list your files just fine. It is important to mention that this setting has nothing to do with the FTP Read Only option, that you https://blogs.technet.microsoft.com/yuridiogenes/2010/03/16/error-502-active-ftp-not-allowed-when-trying-to-list-files-in-a-ftp-session-behind-forefront-tmg-2010/ had in ISA 2004/2006 and still have it on TMG. The FTP Filter when running in read only mode (see figure below) will blocks all commands in the control channel except the following ones: “ABOR, ACCT, CDUP, CWD /0, FEAT, HELP, LANG, LIST, MODE, NLST, NOOP, PASS, PASV, PORT, PWD /0, QUIT, REIN, REST, RETR, SITE, STRU, SYST, TYPE, USER, XDUP, XCWD, XPWD, SMNT” You can customize this list by using the sample script below (from Configuring Add-ins MSDN article),in this example the script configures FTP Access Filter to allow only the USER and PASS commands: Dim root Dim ftpFilter Dim vpSet On Error Resume Next Err.Clear Set root = CreateObject("FPC.Root") ‘ Get the filter's administration object Set ftpFilter = root.GetContainingArray.Extensions.ApplicationFilters("{680A928F-22B3-11d1-B026-0000F87750CB}") If ftpFilter Is Nothing Then Wscript.Echo "FTP Access Filter ({680A928F-22B3-11D1-B026-0000F87750CB}) is not installed in array." WScript.Quit End If ‘ Get the vendor parameter set containing the filter's configuration. Set vpSet = ftpFilter.VendorParametersSets.Item("{680A928F-22B3-11D1-B026-0000F87750CB}") ‘If this vendor parameters set does not exist, create it. If vpSet Is Nothing Then WScript.Echo "Adding a vendor parameters set ({680A928F-22B3-11D1-B026-0000F87750CB})" Err.Clear Set vpSet = ftpFilter.VendorParametersSets.Add("{680A928F-22B3-11D1-B026-0000F87750CB}",False) ftpFilter.VendorParametersSets.Save End If ‘ Add the required parameter. vpSet.Value("AllowReadCommands") = "USER PASS"

a proxy server. The problem is typically caused for one of two reasons: 1 – The Internet Security and Acceleration (ISA) is configured to throw a proxy error to help guard against external or internally-based Internet threats, and 2- The client http://www.tech-faq.com/502-proxy-error.html or server computers are misconfigured or using outdated software. What is a 502 Proxy Error? A 502 proxy error is typically thrown in the HTTP cycle. When the error occurs, a server (does not have to be a Web server) is filling a role similar to a proxy or a gateway server. When a client computer sends an HTTP request (typically a web browser, but can be any software application that is capable of making an HTTP request), it will pass through the proxy error server in order to obtain access to the desired URL. The proxy or gateway subsequently receives a 502 error, or invalid response, from the server located “upstream” in the attempt to fulfill the client request. The majority of the time the error is thrown, the upstream server is functioning appropriately. The proxy or gateway and upstream servers just cannot agree on the appropriate protocol for exchanging the information requested in the original client HTTP request. In many of these cases, either the proxy 502 proxy error or upstream server are not configured correctly or are running incompatible software. Why Does a 502 Proxy Error Get Thrown? During a typical web browsing session, the following is an example of the classic HTTP cycle when a client computer and web server are communicating: Client Computer: The IP address of the desired website will be obtained from the URL of the site from the DNS server. Client Computer: The computer obtains an IP socket connection to the desired IP address and then sends an HTTP data stream through the IP address. Web Server: HTTP data is sent back to the client computer in response to the original HTTP request. The HTTP response will include status codes and other useful information for the client computer. Client Computer: If there is an error in the client’s request or server’s ability to respond, there will be an HTTP error code of 502 included in the server’s response (502 Proxy Error). How to Fix 502 Proxy Errors (Client Side) One of the most frustrating things for the average computer user is determining where the problem resides when receiving the 502 Proxy Error. Before engaging the webmaster of the site or one’s Internet Service Provider (ISP), it is prudent to troubleshoot the client computer to make sure that it is not the reason that the error is being thrown. Step 1 – Close the Internet browser that you are using. If you have an alternate browser on your computer, launch that applica

 

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