Isa Error 502 Proxy Error
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| Address Book | Member List | Search | FAQ | Ticket List | Log Out ISA Error Code 502 Proxy Error Users viewing this topic: none Logged 502 proxy error solution in as: Guest Tree Style Printable Version All Forums >> [ISA 2006 Web 502 proxy error apache Proxy] >> Web Proxy Client >> ISA Error Code 502 Proxy Error Page: [1] Login Message << Older Topic Newer 502 proxy error. forefront tmg denied the specified uniform resource locator Topic >> ISA Error Code 502 Proxy Error - 12.Jun.2007 1:46:22 AM jacod@naledi.com Posts: 1 Joined: 12.Jun.2007 Status: offline Hello all, We are running ISA Server 2006 Enterprise. All users use
Error Reading From Remote Server
web proxy on port 8080 to browse the Internet from the Internal LAN. Our users can succesfully browse the Internet except when they want to access one specific web site. The web site is: http://www.dataviz.com/downloads/demo/index.html?product=RDS When they access the web site, the following ISA error is displayed: Error Code: 502 Proxy Error. The HTTP message includes an unsupported header or an unsupported combination of headers. (12156) the proxy server received an invalid response from an upstream server. Is there something we can do on our side to give access to the specific web site? Thank you. Post #: 1 Featured Links* RE: ISA Error Code 502 Proxy Error - 13.Jun.2007 5:33:22 PM Yorgy Posts: 158 Joined: 20.Sep.2006 Status: offline You may want to look over this KB from Microsoft and consult with them to see if there is a Hot Fix available for 2006. The KB only applies to 2004 with the issue you are experiencing. http://support.microsoft.com/kb/915045/ Yorgy _____________________________Life is a zoo in a jungle! (in reply to jacod@naledi.com) Post #: 2 RE: ISA Error Code 502 Proxy Error - 25.Jun.2007 7:22:21 AM Johan_A Posts: 1 Joined: 27.Apr.2005 From: Sweden Status: offline We got the same error when we try to access http://www.esmaker.net/nx2/ Running ISA 2006 STD. http://www.dataviz.com/downloads/demo/index.html?product=RDS dosent work for us either. Yorgy have you fix the problem? /Johan (in reply to jacod@naledi.com) Post #: 3 RE: ISA Error Code 502 Proxy Error - 27.Jun.2007 12:31:49 PM SFletchall Posts: 2 Joined: 27.Jun.2007 Status: offline How about http://www.gamedev.net/community/forums/themes/theme1/theme.asp How about http://www.wellmark.com ? Now, how about https://www.wellmark.com (notice httpS) Now try https://www.dataviz.com/downloads/demo/index.html?product=RDS(notice httpS) I believe you're experiencing this issue: http://support.microso
a proxy server. The problem is typically caused for one of two reasons: 1 – The Internet isa 502 audit evidence Security and Acceleration (ISA) is configured to throw a proxy error
502 Proxy Error Timeout
to help guard against external or internally-based Internet threats, and 2- The client or server computers are misconfigured
Isa 501
or using 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 http://forums.isaserver.org/ISA_Error_Code_502_Proxy_Error/m_2002046592/tm.htm 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 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. http://www.tech-faq.com/502-proxy-error.html 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 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 th
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 error means, and http://www.chicagotech.net/msapps/isa1.htm how it can be fixed, you will be back in business in little 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 https://www.experts-exchange.com/questions/23738757/ISA-2006-Error-Code-502-Proxy-Error-The-ISA-server-denied-the-specified-URL-12202.html 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 webserver that you are publishing!). Unfortunately that is 502 proxy 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 on the internal server: 1. Open a browser on the internal 502 proxy error 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 is running on a non-standard port, you can encounter this error. Create an access rule allowing the non-standard ports. 502 Proxy Error
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 > ISA 2006 - Error Code 502 Proxy Error. The ISA server denied the specified URL 12202 Want to Advertise Here? Solved ISA 2006 - Error Code 502 Proxy Error. The ISA server denied the specified URL 12202 Posted on 2008-09-17 MS Forefront-ISA Windows Networking 1 Verified Solution 5 Comments 9,295 Views Last Modified: 2011-08-18 Error Code 502 Proxy Error. The ISA server denied the specified Uniform Resource Locator (URL) (12202) I am getting this error returned to proxy clients on a unihomed ISA 2006 server setup only as a web proxy. All HTTP, HTTPS, and FTP traffic is allowed in and out. What's up with this? I have no ACLs filtering websites or anything. 0 Question by:Pugglewuggle Facebook Twitter LinkedIn Google LVL 12 Best Solution byPugglewuggle Good news! It appears to be working fine now. This was related to a DNS issue with our ISP... DNS requests were getting dropped and that's why the site was "not found" and therefore "denied" by ISA! Go to Solution 5 Comments LVL 33 Overall: Level 33 Windows Networking 8 MS Forefront-ISA 3 Message Expert Comment by:MikeKane2008-09-17 Is this to all sites, http and https? Have a look at this KB to begin with: http://support.microsoft.com/kb/936594 Do you have any rules setup in the proxy ? 0 LVL 33 Overall: Level 33 Windows Networking 8 MS Forefront-ISA 3 Message Expert Comment by:MikeKane2008-09-17 You can also try these suggestions from Microsoft: https://www.microsoft.com/communities/newsgroups/list/en-us/default.aspx?dg=microsoft.public.isa&tid=5693ec07-2576-4ad9-9ecd-fe01c335ab49&cat=&lang=&cr=&sloc=&p=1 0 LVL 11 Overall: Level 11 MS Forefront-ISA 6 Windows Networking 1 Message Expert Comment by:EricTViking2008-09-17 Have you configured your access rule to allow http,https from internal to internal? 0 LVL 12 Overall: Level 12 MS Forefront-ISA 2 Windows Networking 1 Mess