Unknown 404 pages not found

Question

We get a lot of 404 page errors that cannot find a reason with the same pattern. We do not redirect these 404 pages, or we do not provide links anywhere for these broken page links.

The common point for these errors is partially processed with the same pattern; Removing the first segment of the URL. Example

This is a true URL,

site.com/category/news/title-of-the-content

site.com/another-category/news/another-title-of-the-content

...

This is what we get 404;

site.com/category/news/

site.com/another-category/news/

...

We are data collection agents for 404 errors, and here they are:

Mozilla / 5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident / 5.0)

Mozilla / 4.0 (compatible; MSIE 7.0; Windows NT 6.2; WOW64; Trident / 6.0; .NET4.0E; .NET4.0C; .NET CLR 3.5.30729; .NET CLR 2.0.50727; .NET CLR 3.0.30729; InfoPath. 2)

Mozilla / 4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident / 4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; InfoPath.2; .NET4. 0C ;. NET4.0E)

Therefore, this error only occurs in Internet Explorer.

We think that this is due to some IE plugins, but cannot find. Does anyone have the same problem? Or what can we do with this situation?

Thanks in advance.

Bonus:

Answer 1

It may have something to do with users using "safe mode" in their browsers. This link shows how Mozilla support addressed a similar situation https://support.mozilla.org/en-US/questions/1003468

Answer 2

It could be a thing: site.com/category/news/title-of-the-content. Category, news all refer to folders on your server. The title also refers to the folder, but may contain the web page in the folder that is displayed in the browser. When you shorten a URL, you mean a folder that cannot have a page. This may be the reason for the appearance of 404 pages because it is not possible to find any page to display.