Why am I getting this 404 error suddenly?

My site worked fine just a few hours ago. And I have not touched it since then. However, as of now, every single page except for the homepage is showing the following message:

404 Not Found

The resource requested could not be found on this server! Powered By LiteSpeed Web Server LiteSpeed Technologies is not responsible for administration and contents of this web site!

The homepage seems to work fine. I can't see any changes and I also scanned it with http://sitecheck3.sucuri.net/ and it returned nothing. I do however, have a plugin called Better WP Security installed and it says that there have been some "Bad login attempts" just before that and that all my WP core files has been modified.

I am not sure what to do now as I don't know how to confirm whether I have been hacked or not.

Could it be my host's fault? Found a thread in a forum with a similar issue: http://www.ukbusinessforums.co.uk/threads/404-not-found-the-resource-requested-could-not-be-found-on-this-server.291094/


It sounds like your .htaccess file has been nuked somehow. A plugin attempting to edit it might have corrupted it (I've seen it before). In any case, download a fresh copy of WordPress and re-upload the .htaccess file into the home directory. Alternatively, you can change your permalinks settings to have it generated automatically.

If your site got hacked, typically you will see some hidden divs and malicious script tags injected into your page and/or within your database. If this happens, you need to restore your most recent backup of your files and database. The files on the server should all be considered compromised and a known clean copy must be used.

I solved this problem by another simple way... On a Dashboard - go to Settings, then Permalinks and click Save Changes. It works perfectly for me.

I had the same problem and saving the permalinks configuration solved for me. As stated here, it happens because there is no .htacess file or that file is corrupted, but I would like to add an observation, at least in my case I didn't have a htacess file because I took a backup from another server and forgot to enable the option to show hidden dot files, thus ending up not including the htacess file in the backup package.

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