Categories 404 not found error?

Can you link (URL?) to your site?

Can you look at this link and confirm if the URLs were posted by you? Especially the last one?

I authored this part of the post:

<iframe id="vvq-614-vimeo-1" src="https://player.vimeo.com/video/55182645?title=0&byline=0&portrait=0&fullscreen=1" width="720" height="480" frameborder="0"><a href="https://www.vimeo.com/55182645">https://www.vimeo.com/55182645</a></iframe></span>ARION DOERR STOPPED BY AND SHOT FOOTAGE OF INK GETTING FORCED THROUGH LOTS OF TINY HOLES ON TO PAPER FOR <a href="https://lineposters.com" target="_blank">LINE POSTERS, INC. </a></p>

it is a video hosted by vimeo.com, i used vimeo quicktags to insert.

OK, that’s fine.

As mentioned in your first post, did you try resetting permalinks to default (the first one)? Can you try now and check if you still get errors?

i reset it and now every category works.

originally i have this `/%category%/%postname%/’ in the custom setting option in my permalink settings. did this change for newer WP versions?

is there malware on my site/server?

i reset it and now every category works.

That means, your original problem is solved, yes?

yes, original problem solved. i am concerned there is a malware problem. is the scan you performed accurate?

is there malware on my site/server?

I don’t think there is any malware, as I have used a few other tools to check your site. The link I provided first possibly raised a false alarm.

ok, thanks for the help.

Great! Please change the topic as resolved. ??

Sucuri is noting an issue specifically with the embed code referenced:

https://sitecheck.sucuri.net/results/roberickson.com/blog

Look at the source code at W3…lines 71 and 72 look suspicious.

https://validator.w3.org/check?uri=http%3A%2F%2Froberickson.com%2Fblog%2F&charset=%28detect+automatically%29&doctype=Inline&ss=1&group=0&user-agent=W3C_Validator%2F1.3+http%3A%2F%2Fvalidator.w3.org%2Fservices