> For the complete documentation index, see [llms.txt](https://docs.ib.b2core.b2broker.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ib.b2core.b2broker.com/for-brokers/back-office-guide/preferences/security/blacklist.md). # Blacklist Any IP address from which multiple failed attempts to authorize are made is automatically blocked for a certain period of time. Such addresses are added to a blacklist, along with the IP addresses that were blocked manually. View the following blacklist settings: **Enabled** The current access permissions set for an IP address. *** **Auth attempts** The maximum number of attempts to authorize or authenticate made from an IP address before it's added to a blacklist. *** **Deny, seconds** The time period for which an IP address is blocked, in seconds. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.ib.b2core.b2broker.com/for-brokers/back-office-guide/preferences/security/blacklist.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.