Question about Twitter Tweets
The Web server (running the Web site) thinks that the HTTP data stream sent by the client (e.g. your Web browser or our CheckUpDown robot) was correct, but access to the resource identified by the URL is forbidden for some reason.
This indicates a fundamental access problem, which may be difficult to resolve because the HTTP protocol allows the Web server to give this response without providing any reason at all. So the 403 error is equivalent to a blanket 'NO' by the Web server - with no further discussion allowed.
By far the most common reason for this error is that directory browsing is forbidden for the Web site. Most Web sites want you to navigate using the URLs in the Web pages for that site. They do not often allow you to browse the file directory structure of the site. For example try the following URL (then hit the 'Back' button in your browser to return to this page):
This URL should fail with a 403 error saying "Forbidden: You don't have permission to access /accounts/grpb/B1394343/ on this server". This is because our CheckUpDown Web site deliberately does not want you to browse directories - you have to navigate from one specific Web page to another using the hyperlinks in those Web pages. This is true for most Web sites on the Internet - their Web server has "Allow directory browsing" set OFF. 403 errors in the HTTP cycle
Any client (e.g. your Web browser or our CheckUpDown robot) goes through the following cycle:
Fixing 403 errors - general
You first need to confirm if you have encountered a "No directory browsing" problem. You can see this if the URL ends in a slash '/' rather than the name of a specific Web page (e.g. .htm or .html). If this is your problem, then you have no option but to access individual Web pages for that Web site directly.
It is possible that there should be some content in the directory, but there is none there yet. For example if your ISP offers a 'Home Page' then you need to provide some content - usually HTML files - for the Home Page directory that your ISP assigns to you. Until the content is there, anyone trying to access your Home Page could encounter a 403 error. The solution is to upload the missing content - directly yourself or by providing it to your ISP. Once the content is in the directory, it also needs to be authorised for public access via the Internet. Your ISP should do this as a matter of course - if they do not, then they have missed a no-brainer step.
If the entire Web site is actually secured in some way (is not open at all to casual Internet users), then an 401 - Not authorized message could be expected. It is possible, but unlikely, that the Web server issues an 403 message instead.
Some Web servers may also issue an 403 error if they at one time hosted the site, but now no longer do so and can not or will not provide a redirection to a new URL. In this case it is not unusual for the 403 error to be returned instead of a more helpful error. So if you have recently changed any aspect of your Web site setup (e.g. switched ISPs), then a 403 message is a possibility. Obviously this message should disappear in time - typically within a week or two - as the Internet catches up with whatever change you have made.
If you think that the Web URL *should* be accessible to all and sundry on the Internet and you have not recently changed anything fundamental in your Web site setup, then an 403 message indicates a deeper problem. The first thing you can do is check the URL via a Web browser. This browser should be running on a computer to which you have never previously identified yourself in any way, and you should avoid authentication (passwords etc.) that you have used previously. Ideally all this should be done over a completely different Internet connection to any you have used before (e.g. a different ISP dial-up connection). In short, you are trying to get the same behaviour a total stranger would get if they surfed the Internet to the Web page URL.
If this type of browser check indicates no authority problems, then it is possible that the Web server (or surrounding systems) have been configured to disallow certain patterns of HTTP traffic. In other words, HTTP communication from a well-known Web browser is allowed, but automated communication from other systems is rejected with an 403 error code. This is unusual, but may indicate a very defensive security policy around the Web server.
Fixing 403 errors - CheckUpDown
The first question is whether the Web page for your URL is freely available to everyone on the Internet. If this is not the case, then you may need to provide two items 2. Web Site User ID and 3. Web Site Password for your CheckUpDown account - but only if your site uses HTTP Basic Authentication. The Web Master or other IT support people at the site will know what security and authentication is used.
If however your Web page is open to all comers and there have been no fundamental changes recently to how your Web site is hosted and accessed, then an 403 message should only appear if your Web server objects to some aspect of the access we are trying to get to your Web site. Because it indicates a fundamental authority problem, we can only resolve this by negotiation with the personnel responsible for security on and around your Web site. These discussions unfortunately may take some time, but can often be amicably resolved. You can assist by endorsing our service to your security personnel. Please contact us (email preferred) if you see persistent 403 errors, so that we can agree the best way to resolve them.
Posted on Jun 30, 2009
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Posted on Jan 02, 2017
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