(Solved) Error: Cookies are blocked or not supported by your browser in WordPress multisite

You may find after mapping a custom domain to your WordPress multisite subdomain that it is no longer possible to get past this error message. In order to resolve this, add the following line to your wp-config file:

define('COOKIE_DOMAIN', false);

I’ve found that this seems to solve the problem.

Akhil Dev

Akhil Dev is an IT Entrepreneur with over 14 years of experience leading the design, development, implementation, and ongoing support of technical solutions and process re-engineering/improvements to solve complex business challenges.

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