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Ftp 502 Proxy Error

trying to list files in a FTP session behind Forefront TMG 2010 ★★★★★★★★★★★★★★★ Yuri Diogenes [MSFT]March 16, 201014 0 0 how to fix 502 proxy error 0 Consider a scenario where you have a client workstation behind Forefront

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TMG 2010 and you are trying to download files from a FTP Server. You are successfully able 502 proxy error the proxy server received an invalid response from an upstream server to logon on the FTP but after type the command “dir” you get the error message below: The message is pretty clear about what is going on, isn’t it? proxy error reading from remote server Well, it is but where do I enable this option? I don’t remember having this on ISA!! To 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

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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 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

| Address Book | Member List | Search | FAQ | Ticket List | Log Out Error Code 502 Proxy Error FTP Login Denied Users viewing this topic: none Logged in as: Guest Tree Style Printable Version All Forums 502 proxy error. forefront tmg denied the specified uniform resource locator >> [ISA Server 2004 Firewall] >> Firewall Client >> Error Code 502 Proxy Error FTP Login proxy error chrome Denied Page: [1] Login Message << Older Topic Newer Topic >> Error Code 502 Proxy Error FTP Login Denied - 16.Mar.2005 6:53:00 PM

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mnowacz Posts: 5 Joined: 16.Mar.2005 Status: offline When a user tries to go to a certain FTP site to register their software, they get the Error Code 502 Proxy Error The login request was denied.If we try to 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/ go to the FTP site from the server, you receive the login screen at the FTP site. If we try it from a client, the clients get the error message.Any assistance would be appreciated. Post #: 1 Featured Links* RE: Error Code 502 Proxy Error FTP Login Denied - 17.Mar.2005 12:45:00 AM tshinder Posts: 50013 Joined: 10.Jan.2001 From: Texas Status: offline Hi Mark,What FTP site?Thanks!Tom (in reply to mnowacz) Post #: 2 RE: Error Code 502 http://forums.isaserver.org/Error_Code_502_Proxy_Error_FTP_Login_Denied/m_270024600/tm.htm Proxy Error FTP Login Denied - 17.Mar.2005 2:03:00 PM mnowacz Posts: 5 Joined: 16.Mar.2005 Status: offline quote:Originally posted by tshinder:Hi Mark,What FTP site?Thanks!Tom (in reply to mnowacz) Post #: 3 RE: Error Code 502 Proxy Error FTP Login Denied - 17.Mar.2005 2:04:00 PM mnowacz Posts: 5 Joined: 16.Mar.2005 Status: offline quote:Originally posted by Mark Nowaczyk: quote:Originally posted by tshinder:Hi Mark,What FTP site?Thanks!TomTom:The site is as follows:ftp:\\ftp.waz6.registeredsite.comThis is a site which our Contribute software for web page editing needs to connect to before we can use the software.ThanksMark (in reply to mnowacz) Post #: 4 RE: Error Code 502 Proxy Error FTP Login Denied - 23.Mar.2005 7:29:00 PM bbaxter51 Posts: 19 Joined: 20.Jan.2005 From: Minneapolis Status: offline The ftp problem with isa 04 is a known issue and microsoft has released a hotfix for it. it's super easy to install and works like a charm, you just have to call them to get it. here's the link to the article.http://support.microsoft.com/default.aspx?scid=kb;en-us;884580 (in reply to mnowacz) Post #: 5 RE: Error Code 502 Proxy Error FTP Login Denied - 8.Apr.2005 2:51:00 AM secabcd Posts: 1 Joined: 8.Apr.2005 Status: offline By looking at the packets, this looks like an authentication problem. In this case, ISA is sending a user name of anonymous and a password of [email protected] to login to the ftp server. FTP server is responding with "530 Logi

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 http://www.tech-faq.com/502-proxy-error.html error to help guard against external or internally-based Internet threats, and 2- The client 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 proxy error 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 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 502 proxy 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 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

 

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