Error 502 Proxy Error Tmg
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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 or internally-based Internet threats, 502 proxy error chrome and 2- The client or server computers are misconfigured or using outdated software. What is
502 Proxy Error Web Service
a 502 Proxy Error? A 502 proxy error is typically thrown in the HTTP cycle. When the error occurs, a server (does not have 502 proxy error apache reverse proxy 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 any software application that is capable of https://support.microsoft.com/en-us/kb/2423401 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 on the appropriate protocol for exchanging the information requested in http://www.tech-faq.com/502-proxy-error.html 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 (ISP), it is prudent to troubleshoot the client computer to make sure that it is not the reason that the error
502 Proxy Error Whenever an ISA or TMG server throws a 502 Proxy Error your way, you know you are probably in for a real hurdle. But with a little familiarity with what a 502 http://www.chicagotech.net/msapps/isa1.htm error means, and how it can be fixed, you will be back in business in little https://www.experts-exchange.com/questions/24756762/Forefront-TMG-keep-getting-the-following-error-Error-Code-502-Proxy-Error.html time. First, lets take a look at the definition of 502 HTTP response code: 502 Bad Gateway The server was acting as a gateway or proxy and received an invalid response from the upstream server. Pay close attention to what that is saying. The proxy (meaning your ISA or TMG server) received an invalid response from the upstream server (implying that the internal 502 proxy webserver that you are publishing!). Unfortunately that is not always the case as ISA and TMG can throw that error when they are unhappy about something that a normal browser would readily accept. They can also throw one of several different kinds of 502 depending on the circumstances. Understanding is critical to a quick resolution. Dont just stop reading at 502, check the rest of the response. Here is how to determine whether the problem is with your ISA/TMG, or 502 proxy error on the internal server: 1. Open a browser on the internal network. 2. Access the URL in question. 3. If you can view the content successfully, the problem is with your ISA/TMG. If not, the problem is with your webserver. Since this post is about ISA and TMG, lets assume you are able to view the content internally just fine, so well keep discussing ISA/TMG. 4. Go to your log viewer. In ISA that is Monitoring, or in TMG that is in Logs & Reports. 5. Edit the filter to look at live logs and have the user try again, or filter on the time range to see the error. Add the Filter by criteria for HTTP Status Code, and set it equal to 502. 6. Run the query, and examine the results. Some of the frequent causes of ISA/TMG generating 502s are: A 502 can be thrown by the ISA/TMG when content filtering is enabled and something in the response is being blocked. Disable content filtering and see if you are then able to access the resource. If you are, look at the header in one of the logged errors (in your log, click the more information link on the error) and see what content type is being returned by the published server. Authorize that in your content filter. If you are using ISA/TMG as a client proxy, and the destination server
for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Ask a Question Ask for Help Receive Real-Time Help Create a Freelance Project Hire for a Full Time Job Ways to Get Help Expand Search Submit Close Search Login Join Today Products BackProducts Gigs Live Careers Vendor Services Groups Website Testing Store Headlines Experts Exchange > Questions > Forefront TMG keep getting the following error Error Code: 502 Proxy Error. Want to Advertise Here? Solved Forefront TMG keep getting the following error Error Code: 502 Proxy Error. Posted on 2009-09-23 MS Forefront-ISA 1 Verified Solution 6 Comments 26,484 Views Last Modified: 2012-05-07 I have configured the proxy but i keep getting the following error. Cant find what to do next. I am usring ForeFront TMG Forefront Threat Management Gateway Microsoft Corporation Version: 6.0.6417.100 MBE 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 Forefront TMG denied the specified Uniform Resource Locator (URL). (12202 0 Question by:GeorgeKunk Facebook Twitter LinkedIn Google LVL 10 Best Solution byahmedabdelbaset Hi, Try to Create Access Rule from Internal to External and check . If above doesn't work , check http://www.isaserver.org/articles/exportsslcert.html Go to Solution 5 Comments LVL 10 Overall: Level 10 MS Forefront-ISA 5 Message Accepted Solution by:ahmedabdelbaset2009-09-24 Hi, Try to Create Access Rule from Internal to External and check . If above doesn't work , check http://www.isaserver.org/articles/exportsslcert.html 0 LVL 10 Overall: Level 10 MS Forefront-ISA 5 Message Expert Comment by:ahmedabdelbaset2009-09-24 Following this http://www.isaserver.org/tutorials/Installing-Forefront-Threat-Management-Gateway-Forefront-TMG-Beta1.html part 2 and 3 Also http://www.isaserver.org/tutorials/Creating-Web-Access-Policy-Forefront