Http 502 Proxy Error 12015
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502 Bad Gateway Meaning
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502 Bad Gateway Fix
Error http 502 12015 Page: [1] Login Message << Older Topic Newer Topic >> FTP through ISA Web Proxy - Error http 502 12015 - 15.Dec.2003 9:44:00 PM jfisaorg Posts: please explain this 502 bad gateway error 5 Joined: 15.Dec.2003 Status: offline I'm trying to connect to ftp site that requires authentication through isa web proxy without firewall client installed.I always get http 502 error - The login request was denied (12015).Anyone has a idea ?Thanks in advance !Jeff Post #: 1 Featured Links* RE: FTP through ISA Web Proxy - Error http 502 12015 - 19.Dec.2003 2:43:00 AM ronmcdonald 502 police code Posts: 38 Joined: 18.Dec.2003 From: Maryland Status: offline Hi Jeff,I have come across the same issue. I have found this article recently from Microsoft. MSFT Support - KB Article 823261 From what there saying in the article there is a issue with the remote FTP server respond code and how ISA interprets it. Sound like a bug to me.. (in reply to jfisaorg) Post #: 2 RE: FTP through ISA Web Proxy - Error http 502 12015 - 19.Dec.2003 3:13:00 AM ronmcdonald Posts: 38 Joined: 18.Dec.2003 From: Maryland Status: offline I am able to reproduce my issue by going to Linksys FTP Site Hears my error:HTTP 502 Proxy Error - The user name was not allowed. Try a different name, or retry the same name after verifying that it is typed correctly. (12013)Using the CMD prompt I did some investigating to see what type of FTP server or daemon they were using; see results:C:\>ftp ftp.linksys.comConnected to ftp.linksys.com.220---------- Welcome to Pure-FTPd ----------This issue that ISA is having seems more to be with compatibility issues with different FTP servers.. (in reply to jfisaorg) Post #: 3 RE: FTP t
Management Gateway I had the hardest time trying to get one particular site to work from behind a TMG 2010 proxy. The users
504 Bad Gateway
would get. Error Code: 502 Proxy Error. The data is invalid. (13) http 504 IP Address: 84.233.1 Date: 17/03/2011 02:34:51 PM [GMT] Server: Source: web filter Thiscorrelatedwith the following log event on
Http 501
the TMG server. Failed Connection Attempt Log type: Web Proxy (Forward) Status: 13 The data is invalid. Rule: Source: Internal (10.36.136.250:35447) Destination: External (84.233147:80) Request: GET http://lc.com/PORTAL/TOPLEVEL.php Filter information: Req ID: http://forums.isaserver.org/FTP_through_ISA_Web_Proxy_-_Error_http_502_12015/m_100069700/tm.htm 0fdbab91; Compression: client=No, server=Yes, compress rate=0% decompress rate=0% Protocol: http User: anonymous The big problem I had is that this site "worked just fine" from a direct Internet connection. I used HTTP watch to trace the connection to the site. While goign through the STREAM view I noticed the following: The page was hosted on a Red Hat Apache server. (Just because http://fixmyitsystem.com/2011/03/tmg-error-code-502-proxy-error-data-is.html it is at the top of the header) Content Encoding was GZIP The GZIP thing got me because only the one single page was being compressed. When scrolling further down the stream data I saw something strange - after the gzip data segment (green) there was "clear text" again. (Amber) I had not seen this before. This did not look right, maybe that is what TMG was on about. I check that the server would send me an uncompressed version of the page with some TamperData request header manipulation, and thankfully it did. Then I moved onto the TMG to exclude the site form requesting compressed data. Create a computer or computer set object. Open the HTTP compression setting Add the computer object to the exceptions That finally fixed the problem loading that page. GZIP implemented correctly is a fantastic thing - Do it badly and it cause cause issues, That is why I prefer to do all my compression on a reverse proxy TMG. Just goes to show you TMG was correct in dropping non standard or compliant data. Browsers were far
This server received an invalid response from an upstream server it accessed to fulfil the request. This usually does not mean that the upstream server is down (no http://www.checkupdown.com/status/E502.html response to the gateway/proxy), but rather that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data. Given that Internet protocols are quite clear, it often means that one or both machines have been incorrectly or incompletely programmed. Fixing 502 errors - general This problem is due to poor IP communication between back-end computers, possibly including the Web server at the site you are trying to bad gateway visit. Before analysing this problem, you should clear your browser cache completely. If you are surfing the Web and see this problem for all Web sites you try to visit, then either 1) your ISP has a major equipment failure/overload or 2) there is something wrong with your internal Internet connection e.g. your firewall is not functioning correctly. In the first case, only your ISP can help you. In the 502 bad gateway second case, you need to fix whatever it is that is preventing you reaching the Internet. If you get this problem for only some of the Web sites you try to visit then it is likely to be a problem at those sites i.e. one of their pieces of equipment is failing/overloaded. Contact the people at those sites. Fixing 502 errors - CheckUpDown Our service monitors your site for HTTP errors like 502. Use of proxies and caching is increasing on the Web. Our CheckUpDown robot will always try to "drill through" to the real computer that actually hosts the Web site, but we do not have complete control over where our HTTP request actually ends up. If only one link in the chain of computers dealing with our HTTP request is broken, then an error such as 502 can easily occur. Please contact us (email preferred) whenever you encounter 502 errors - there is nothing you can do to sort them out. We then have to liaise with your ISP and the vendor of the Web server software so that they can review the flow of IP data traffic between various computers under their control. 502 errors in the HTTP cycle Any client (e.g. your Web browser or o