Custom Cookie Block

What It Means

This request carried a cookie whose name is on your WAF’s blocklist.

Why It Matters

Cookie rules let you stop specific clients by setting a cookie on them that you have defined as blocked. Only the cookie name is checked, not its value.

Common Triggers

A client that has a cookie set with a name you or your team blocked.

What To Do

If this block is unexpected, review your blocked cookies in the WAF dashboard. See Blocking Clients via Cookies. Remove the rule if the block is no longer needed.