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Ftp Proxy Error 502

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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 http://forum.rebex.net/158/error-502-returned-by-http-proxy ( 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 proxy error 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 502 proxy error 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 earlier versions) is restarted, it should work. commented Apr 9, 2010 by Sven Peeters (120 points) Hi, As I stated, I have no access to the ISA-Server. But how can that LeechFTP can use the same proxy to connect to the FTP-server without any problems. Regards, Sven Peeters commented Apr 9, 2010 by Lukas Pokorny (74,250 points) Hello, please check out http://www.rebex.net/ftp.net/faq.aspx#proxy_http - it looks like LeechFTP might be using the HTTP protocol to access FTP servers over the proxy, which is not supported by Rebex FTP (because no FTP protocol is actually being used). Does LeechFTP produce any log to make it possible to tell whether this is the

 

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