My phpbb3 move to new host.
but posing display:
[quote]You don't have permission to access /phpBB3/posting.php on this server.-

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.[/quote]

Fix way:
1,login your phpbb admin cp.
2,click left nav "Search settings"
3,find
[quote]"Enable fulltext updating
Updating of fulltext indexes when posting, overridden if search is disabled"[/quote]
4,selcet right "no"
5,submit