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However, it is possible that there's something wrong on your end and we'll work through those possibilities below.
Try loading the URL again by pressing F5 on your keyboard, or by clicking the refresh/reload button.
While the 502 Bad Gateway error is usually indicating a networking error outside of your control, it could be extremely temporary. Trying the page again will often be successful.
Start a new browser session by closing all open browser windows and then opening a new one. Then try opening the webpage again.
It's possible that the 502 error you received was due to an issue on your computer that occurred sometime during this use of your browser. A simple restart of the browser program itself could solve the problem.
Clear your browser's cache. Outdated or corrupted files that are being stored by your browser could be causing 502 Bad Gateway issues.
Removing those cached files and trying the page again will solve the problem if this is the cause.
Note: If you'd rather not clear all of your cookies, you could first try removing only those cookies related to the site you're getting the 502 error on. It's best to remove them all but it won't hurt to try the clearly applicable one(s) first.
Start your browser in Safe Mode. Running a browser in Safe Mode means to run it with default settings and without add-ons or extensions, including toolbars.
If the 502 error no longer appears when running your browser in Safe Mode, you know that some browser extension or setting is the cause of the problem. Return your browser settings to default and/or selectively disable browser extensions to find the root cause and permanently fix the problem.
Note: A browser's Safe Mode is similar in idea to the Safe Mode in Windows but it is not the same thing. You do not need to start Windows in Safe Mode to run any browser in its particular "Safe Mode."
If an alternative browser doesn't produce a 502 Bad Gateway error, you now know that your original browser is the source of the problem. Assuming you've followed the above troubleshooting advice, now would be the time to reinstall your browser and see if that corrects the problem.
Important: This is not a common solution to 502 Proxy Error messages and only applies in this particular situation. Forefront TMG 2010 is a business software package and you would know if you have it installed.
Restart your computer. Some temporary issues with your computer and how it's connecting to your network could be causing 502 errors, especially if you're seeing the error on more than one website. In these cases, a restart would help.
Restart your networking equipment. Issues with your modem, router, switches, or other networking devices could be causing 502 Bad Gateway or other 502 errors. A simple restart of these devices could help.
Tip: The order you turn off these devices isn't particularly important, but be sure to turn them back on from the outside in. In other words, turn on the outermost hardware on the network first (usually your modem), followed by the device it's connected to (usually your router). Next would be any switch or other device between the router and your computer.
Note: Unless you've previously changed them, the DNS servers you have configured right now are probably the ones automatically assigned by your ISP. Fortunately, a number of other DNS servers are available for your use that you can choose from. See my Free & Public DNS Servers list for your options.
Contacting the website directly might also be a good idea. Chances are, assuming they're at fault, the website administrators are already working on correcting the cause of the 502 Bad Gateway error but feel free to let them know about it.
See my Website Contact Information page for a list of contacts for popular websites. Most websites have social networking accounts they use to help support their services. Some even have telephone and email contacts.
Tip: If you suspect that a website is down for everyone, especially a popular one, checking Twitter for chatter about the outage is often very helpful. The best way to do this is to search for #websitedown on Twitter, as in #cnndown or #instagramdown.
Contact your Internet Service Provider. If your browser, computer, and network is working, and the website reports that the page or site is working for them, the 502 Bad Gateway issue could be caused by a network issue that your ISP is responsible for.
Come back later. At this point in your troubleshooting, the 502 Bad Gateway error message is almost certainly an issue with either your ISP or with the web site's network - one of the two parties may have even confirmed that for you if you contacted them directly.
Either way, you're not the only one with seeing the 502 error and you'll need to wait until the problem is solved for you.
A 504 error is a Gateway Timeout and is a problem on the website side not with your computer or internet connection. Try doing a reload or waiting for a while then try again as the server problem may be temporary or perhaps just a scheduled reboot.
If you continue to receive to the 504 then you should contact the website concerned to notify them of the 504 timeout.
A server (not necessarily a Web server) is acting as a gateway or proxy to fulfil the request by the client (e.g. your Web browser or our CheckUpDown robot) to access the requested URL. This server did not receive a timely response from an upstream server it accessed to deal with your HTTP request.
This usually means that the upstream server is down (no response to the gateway/proxy), rather than that the upstream server and the gateway/proxy do not agree on the protocol for exchanging data.
504 errors in the HTTP cycle
Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle when it communicates with the Web server: Obtain an IP address from the IP name of the site (the site URL without the leading 'http://'). This lookup (conversion of IP name to IP address) is provided by domain name servers (DNSs). Open an IP socket connection to that IP address. Write an HTTP data stream through that socket. Receive an HTTP data stream back from the Web server in response. This data stream contains status codes whose values are determined by the HTTP protocol. Parse this data stream for status codes and other useful information.
This error occurs in the final step above when the client receives an HTTP status code that it recognises as '504'. Frank Vipond. September 2010.
Fixing 504 errors - general
This problem is entirely due to slow IP communication between back-end computers, possibly including the Web server. Only the people who set up the network at the site which hosts the Web server can fix this problem.
Fixing 504 errors - CheckUpDown
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 504 can easily occur.
Please contact us (email preferred) whenever you encounter 504 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. However this is not an easy error to sort out, because the ebb and flow of Internet traffic makes this type of error very transient., with little chance of any real fix, as really there isn't much the end user can do?
Short answer, get another download site... or get a torrent link?
Error 500 to 504 are usually nothing to do with your system, they are errors created by the server you are trying to connect to.
A server (not necessarily a Web server) is acting as a
gateway or proxy to fulfil the request by the client (e.g. your Web
browser or our CheckUpDown robot) to access the requested URL. This
server did not receive a timely response from an upstream server it
accessed to deal with your HTTP request.
Resolving 504 errors - general
This problem is entirely due to slow IP communication between back-end computers, possibly including your Web server. Only the people who set up the network at the site which hosts the Web server can fix this problem. Resolving 504 errors - CheckUpDown
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 your 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 504 can easily occur.
Please contact us (email preferred) whenever you encounter 504 errors - there is nothing you can do to sort them out. We then have to liaise with your ISP and the vendor of your Web server software so that they can review the flow of IP data traffic between various computers under their control. However this is not an easy error to sort out, because the ebb and flow of Internet traffic makes this type of error very transient.
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