Error 502 Proxy Error Ftp
Contents |
Microsoft Tech Companion App Microsoft Technical Communities Microsoft Virtual Academy Script Center Server and Tools Blogs TechNet Blogs TechNet Flash Newsletter TechNet Gallery TechNet Library TechNet Magazine TechNet Subscriptions 502 proxy error apache TechNet Video TechNet Wiki Windows Sysinternals Virtual Labs Solutions Networking Cloud and Datacenter 502 proxy error dns lookup failure Security Virtualization Downloads Updates Service Packs Security Bulletins Windows Update Trials Windows Server 2012 R2 System Center 2012 R2
502 Proxy Error Apache Error Reading From Remote Server
Microsoft SQL Server 2014 SP1 Windows 8.1 Enterprise See all trials » Related Sites Microsoft Download Center TechNet Evaluation Center Drivers Windows Sysinternals TechNet Gallery Training Training Expert-led, virtual classes Training Catalog
502 Proxy Error Reason Error Reading From Remote Server
Class Locator Microsoft Virtual Academy Free Windows Server 2012 courses Free Windows 8 courses SQL Server training Microsoft Official Courses On-Demand Certifications Certification overview MCSA: Windows 10 Windows Server Certification (MCSE) Private Cloud Certification (MCSE) SQL Server Certification (MCSE) Other resources TechNet Events Second shot for certification Born To Learn blog Find technical communities in your area Support Support options For business For 502 proxy error openshift developers For IT professionals For technical support Support offerings More support Microsoft Premier Online TechNet Forums MSDN Forums Security Bulletins & Advisories Not an IT pro? Microsoft Customer Support Microsoft Community Forums United States (English) Sign in Home Library Wiki Learn Gallery Downloads Support Forums Blogs We’re sorry. The content you requested has been removed. You’ll be auto redirected in 1 second. Forefront Threat Management Gateway (TMG) Internet Security and Acceleration (ISA) Server 2006 Operations Operations Troubleshooting Outbound FTP Access in ISA Server Troubleshooting Outbound FTP Access in ISA Server Troubleshooting Outbound FTP Access in ISA Server ISA Server Operations Guide Monitoring, Logging, and Reporting Features in ISA Server 2006 Troubleshooting Outlook Web Access Publishing Enterprise Management in ISA Server 2006 Role-based Administration in ISA Server 2006 Configuring ISA Server to Work with SSL Accelerators Customizing HTML Forms Using the HTTP Filter to Help Secure HTTP Access Secure Logoff from Published Web Sites How to Customize HTML Error Messages in ISA Server 2006 Performance and Availability Improving Web Proxy Client Authentication Performance on ISA Server 2006 Configuring and Troubleshooting the Password Change Feature in ISA Server 2006 Le
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
502 Proxy Error Chrome
you have a client workstation behind Forefront TMG 2010 and you are trying 502 proxy error web service to download files from a FTP Server. You are successfully able to logon on the FTP but after 502 proxy error apache reverse proxy type the command “dir” you get the 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 https://technet.microsoft.com/en-us/library/bb794745.aspx 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 able to list your files just fine. It is important to mention that this setting 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/ 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 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 "Ad
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 http://forum.rebex.net/158/error-502-returned-by-http-proxy 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 502 proxy 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 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 502 proxy error 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) 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,
We use a HTTP Proxy (NTLM Authentification). following code generates the error An unhandled exception of type 'Rebex.Net.FtpException' occurred in Rebex.Net.Ftp.dll Additional information: Error 502 returned by a HTTP proxy (Proxy Error ( The specified Secure Sockets Layer (SSL) port is not allowed. ISA Server is not configured to allow SSL requests from this port. Most Web browsers use port 443 for SSL requests. )). Dim client As Ftp = New Ftp client.Proxy.ProxyType = FtpProxyType.HttpConnect client.Proxy.Host = "proxy" client.Proxy.Port = 8080 client.Proxy.UserName = "DOMAIN\USER" client.Proxy.Password = "PASSWORD" client.Connect("FTPSERVER", 21) Any idea's ? Sven Peeters http-proxy faq error-502 proxy ftp Applies to: Rebex FTP/SSL Please log in or register to add a comment. Please log in or register to answer this question. 1 Answer 0 votes answered Apr 7, 2010 by Martin Vobr (12,740 points) edited Apr 7, 2010 This is probably caused by the default behavior of Microsoft ISA server, which only allows requests to ports 443 and 563 using its HTTP Connect method. (Primary use of HTTP Connect is to allow SSL connections to HTTPS servers). The Microsoft Knowledge Base article Q283284 addresses this issue. To access FTP sites through ISA server's HTTP proxy, access to all ports must be allowed. FTP's control connection port is 21 by default, but data connections can use virtually any port, because it is assigned by the FTP server. (Although allowing port 21 and ports >1024 should be enough, there might be exceptions.) To allow connections to all ports through the HTTP proxy, following VB script must be run on the ISA server: set isa=CreateObject("FPC.Root") set arraypolicy=isa.Arrays.GetContainingArray.ArrayPolicy set tprange=arraypolicy.WebProxy.TunnelPortRanges set tmp=tprange.AddRange("FTP", 1, 65535) tprange.Save After the script is run and "Microsoft Firewall Service" ("Microsoft ISA Server Control" in ea