Custom Cookie Block

What It Means

This request’s cookies contained text that is on your WAF’s cookie blocklist.

Why It Matters

Cookie rules let you stop specific clients by setting a cookie on them that you have defined as blocked. A rule matches its text anywhere in the request’s cookies, in a name or a value, and is case-sensitive.

Common Triggers

A client whose cookies include text you or your team blocked. A short or common rule can match cookies that real visitors carry.

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.