Wordpress http post 404 -

i have error in wp every time http post 404

i have ready error field names , not that, if fields named random names, or no fields, still 404 error.

it happens http post 404, if on same server or not.

this happens when permalink set "post name"

any fixing error gratefully appreciated

cleared cache , restarted router (dynamic ip) , worked, host must have confused me hacker