Block Microsoft Exchange Autodiscover requests

In some cases, Microsoft Exchange Autodiscover service requests can be "noisy", triggering large numbers of HTTP 404 (Not found) errors.

This example blocks requests for autodiscover.xml and autodiscover.src:

• Expression: (ends_with(http.request.uri.path, "/autodiscover.xml") or ends_with(http.request.uri.path, "/autodiscover.src"))
• Action: Block

Alternatively, customers on a Business or Enterprise plan can use the matches comparison operator for the same purpose. For this example, the expression would be the following:

(http.request.uri.path matches "/autodiscover.(xml|src)$")

Was this helpful?

What did you like?

Accurate

Easy to understand

Solved my problem

Helped me decide to use the product

Other

What went wrong?

Hard to understand

Incorrect information

Missing the information

Other

Thank you for helping improve Cloudflare's documentation!