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Isa Proxy Error Code 502

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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 http://www.tech-faq.com/502-proxy-error.html 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against external or internally-based Internet threats, and 2- The client or server computers are misconfigured or using outdated software.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 http://www.ibm.com/support/docview.wss?uid=swg21351807 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 is denied the specified 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) One of

1351807; CC; Network Access Message: The page cannot be displayed; Error Code: 502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL). (12202); Error Code: 502 Proxy Error; The ISA Server denied the specified Uniform Resource Locator (URL); (12202); 502 Proxy Error Technote (troubleshooting) This document applies only to the following language version(s): English Problem(Abstract) This technote explains how to resolve an error, Error Code: 502 Proxy Error.The ISA Sever denied the specified Uniform Resource Locator. that can occur when using IBM Rational ClearCase Remote Client (CCRC) and accessing CCRC help. Symptom When trying to access the help through CCRC, the following error message is reported: This is only the text from the above message to help improve the searchability of this technote: Error Message Network Access Message: The page cannot be displayed Explanation: There is a problem with the page you are trying to reach and it cannot be displayed. Try the following: Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion. Check spelling:Check that you typed the Web page address correctly. The address may have been mistyped. Access from a link:If there is a link to the page you are looking for, try accessing the page from that link. If you are still not able to view the requested page, try contacting your administrator or Helpdesk. Technical Information (for support personnel) Error Code: 502 Proxy Error. The ISA Server denied the specified Uniform Resource Locator (URL). (12202) IP Address: 123.12.12.12 Date: 12/29/2008 7:25:49 PM Server: server.abc.12345.com Source: proxy Cause This error is specific to using Microsoft's Internet Security and Acceleration Server: http://www.microsoft.com/forefront/edges

 

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