Custom Permalinks – Error 400 – Bad Request

Hi,

I’m trying to use a custom permalink structure on a new install of wordpress, on linux server.

Under Custom I am putting – /%category%/%postname%/

When I save the changes, I get the error message below, which I do not understand. How can I solve this?

Thanks for any help.

Error 400: Bad Request

Your browser sent a request that this server could not understand.

Probable reasons are:

* You sent a plain HTTP request to an SSL-enabled server port. Instead please use the HTTPS protocol to access this URL, like this: https://example.com:8443/
* You made a typo in the request, e.g., typed a comma instead of a colon. Please re-check the URL.

Please contact your webmaster if you are not sure what goes wrong.