今天在测试一个newsletter的wordpress插件“newsletter”，启用后突然后台无法进入，提示“406 Not Acceptable”错误，前台没问题。

搜索了一下，正好就在inmotionhosting（我现在的hosting provider）有讲到解决方案。

Most “406 Not Acceptable” errors on websites are likely related to the mod_security setting on your InMotion Hosting account.

By default, all hosting accounts have mod_security turned on. There are some programs out there that do require mod_security to be turned off. If you do not disable mod_security it will cause a 406 error message.

Mod_security can be turned off and on for each domain individually. If you would like mod_security disabled you can disable mod_security via our Modsec manager plugin in cPanel.

ok，那就去cPanel里面禁用吧。还真好了。奇怪的是，后台好了以后，再去启用mod_security，毕竟安全还是蛮重要的，居然还是没问题的。

奇怪啊，奇怪！就这么莫名其妙的解决了。