404 error for login page

Hi,

I have been using this security plugin for over 1.5 years.

I haven’t faced a single issue. However few days back i moved from one hosting to another.

After that I am getting 404 error for my admin page.

I have setup my login page to by http://mysite.com/cuslogin

Login page loads fine , after entering credentials , wp-admin page goes to error.

Please help me resolve this issue.
My host is not able to help me much.

https://ww.wp.xz.cn/plugins/better-wp-security/