wordpress category page 404 - wordpress

I have updated a category slug and now my category page for that category is displaying a 404. I have tested doing this on a staging site and it works fine but when I do this on production for some reason I get a 404.
I have,
resaved permalinks hundreds of times
deactivated plugins
disabled all caching
restarted my server
I am completely confused and cannot understand why wordpress is so fragile around permalinks and urls.
Thanks

I went to Settings > Permalink, I changed nothing, validated and... it worked. Perhaps a default setting was missing.

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So my WordPress site worked perfectly on my localhost, until I transferred it to my Windows Server machine. Now, only the index still works; the other pages give me a 404 error.
I have already tried changing permalink options and other fixes, but nothing has worked.
How I can get my other pages online?
Its too easy
go to wp-admin in your WordPress.
in dashboard go to settings.
in settings go to Permalink Settings.
in Permalink Settings if your Common Settings set on Day and name or anything else change it to Plain.
save the setting and go to your web pages.
if every things work correctly back to Permalink Settings and change Common Settings on Day and name or anything you want.

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I have tried the following:
Renamed the "plugins" directory to "plugins1" to disable the plugins
Reverted to the default wordpress ".htaccess" file
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SSL is enabled on the site but not configured to be used anywhere, all links (that I'm aware of reference http://)
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define ('WP_HOME','http://www.test.co.uk');
define('WP_SITEURL','http://www.test.co.uk);
I'm not sure whats changed in the last couple of days but we think a plugin got updated. Would disabling the plugins prove that its nothing to do with plugins?I'm new to WordPress so apologies if I got some terms wrong.
Any suggestions I could try looking at would be helpful.
Thanks
try to set Home url and site url to http://www.test.co.uk from your WP admin panel

All pages and posts in Wordpress redirect to homepage

I've been having this problem a couple times now and I'm not sure what is causing it. I have tried disabling all plugins, resetting permalinks, and resetting to the default .htacccess file but this time I seem to not be able to fix this issue.
Whenever I try to visit any post or page, instead of displaying a post at /post-name/ it displays a list of my latest posts.
I thought I read about the publishing dates affecting this once but I'm not sure.
Any help you could provide would be awesome!
edit: I've installed and activated a different theme and it did not solve the problem. I still see a list of lastest posts on every page/post.
If you have the Yoast SEO plugin enabled, try deactivating it or making sure there are no links with permanent 301 redirects to Home

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I have a somewhat strange issue with WordPress today. This behaviour has only begun in the last week or so as far as I can ascertain.
Any page with the slug "downloads" links to it's parent page instead of to it's own page.
I have tried the following:
Reset permalinks to default and then back to %postname%
Disabled all plugins
Physically cleared the cache
But none of the above fix the issue. The weird thing is that this behaviour is only happening for pages with the slug "downloads". For all other slugs it is fine.
For example there are multiple instances of the slug "get-involved" with different parents and all work fine. But when the same is done with "downloads" the links redirect to their parent. Is anyone else experiencing this issue?
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I've read a lot of different posts online on this, but nothing seems to be working.
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Could there be something wrong on the server side? If so, what could I do? I have access to the kettle server, but I'm not sure where to begin looking.
Try savings your permalinks again, sometimes this works for me.

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