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Myra Online Help Updated · 21 Aug 2026

Matching fingerprints

A WAF rule with the Fingerprint condition allows you to identify clients based on their fingerprint. You match the fingerprint fp1 directly via the Fingerprint condition. For the fingerprints fp2 or fp3, specify the value with the fp2: or fp3: prefix.

Example_match_FP_1_EN

Condition: Match fingerprint fp3

For example, proceed as follows to match the fingerprint:

  • ► Select Request as the request method.
  • ► Add the Fingerprint condition.
  • ► Select the EXACT operator from the drop-down list.
  • ► Enter fp3:A=nd6dCdBnLb as the value.

Fingerprint with an exception for a user agent

Example_match_FP_2_EN

Fingerprint with a user agent exception

For example, to match a fingerprint without including a specific legitimate user agent, combine two conditions:

  • ► Select Request as the request method.
  • ► Add the Fingerprint condition.
  • ► Select the EXACT operator from the drop-down list.
  • ► Enter 9b4463ad4601 as the value.
  • ► Add the User Agent Header condition.
  • ► Select the NOT REGEX operator from the drop-down list.
  • ► Enter .*DuckDuckBot-Https/1\.1;.*$ as the value.
  • ► Add the CAPTCHA action.