None of the forms are submitting
This can happen when there are problems with your local .htaccess file -- it might be that Apache locally is not set up to read .htaccess files, or there may be an error in the file, or it may be missing altogether.

If the issue is specifically with the login form, you might be having issues with HTTP/HTTPS switching if your site is configured to attempt to negotiate the scheme, but your local server is not configured to serve HTTPS.