502 Proxy Error Tmg
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Error Code 502 Proxy Error. Forefront Tmg Denied The Specified
TMG servers with a Single Array and Single CSS Serveron Windows Server 2008 R2 SP1 with the latest patches 502 proxy error apache and LatestTMG Updates. Current Version is 7.0.9193.540 We have configured it on Single Network Adapter Template. It seems that everything is working fine but some time the Users are facing the below 502 proxy error dns lookup failure mention Error Message. Please if anyone can help me out of this as I have browsed for the above mention issue but I couldn’t find anything specific related to my query.
502 Proxy Error Apache Error Reading From Remote Server
- www.it-training-grote.de - www.forefront-tmg.de - www.nt-faq.de Proposed as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Tuesday, March 12, 2013 5:07 AM Marked as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Monday, March 18, 2013 2:14 AM Thursday, March 07, 2013 11:45 AM Reply | Quote 0 Sign in to vote Hi, Thank you for the post. This is normal behavior if the request that is blocked by the flood mitigation mechanism. Please look into live logging see which client was generate this error and check if there is malware or virus involved the traffic. RegardsNick Gu - MSFT Proposed as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Tuesday, March 12, 2013 5:07 AM Marked as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Monday, March 18, 2013 2:14 AM Friday, March 08, 2013 7:34 AM Reply | Quote Moderator All replies 0 Sign in to vote Hi, add the clients to the Flood mitigation exceptions: http://technet.microsoft.com/en-us/library/bb838988.aspx http://technet.microsoft.com/en-us/library/dd441028.aspxregards Marc Grote aka Jens Baier - www.it-training-grote.de - www.forefront-tmg.de - www.nt-faq.de Proposed as answer by Nick Gu - MSFTMicrosoft contingent staff, Moderator Tuesday, March 1
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502 Proxy Error Chrome
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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 http://www.tech-faq.com/502-proxy-error.html or internally-based Internet threats, and 2- The client or server computers are misconfigured or using http://fixmyitsystem.com/2011/03/tmg-error-code-502-proxy-error-data-is.html 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 502 proxy 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 is thrown, the upstream server is functioning appropriately. The proxy or gateway and upstream servers just cannot agree 502 proxy error 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) 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
Management Gateway I had the hardest time trying to get one particular site to work from behind a TMG 2010 proxy. The users would get. Error Code: 502 Proxy Error. The data is invalid. (13) IP Address: 84.233.1 Date: 17/03/2011 02:34:51 PM [GMT] Server: Source: web filter Thiscorrelatedwith the following log event on 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: 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 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 i