# 9090\_external\_internal **Explanation** This event is triggered by Netography's Fusion Portal when it detects a server on your network listening on port 9090 that has received a connection from an external IP address. The NDM works by identifying return traffic flowing from the server (in this case, the SRCIP) to an external IP address. This return traffic indicates that there may have been an external attacker that communicated with an internal device that had port 9090 exposed. Port 9090 is used for several purposes, including Linux server administration as well as management of several Ivanti products. **What to Look For** Investigate the SRCIP and determine if this server should have port 9090 exposed to external sources. **Related MITRE ATT\&CK Categories** [Initial Access, Persistence: External Remote Services, Technique T1133 - Enterprise](https://attack.mitre.org/techniques/T1133) [Initial Access: Exploit Public-Facing Application, Technique T1190 - Enterprise](https://attack.mitre.org/techniques/T1190) --- # Agent Instructions: 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: ``` GET https://docs.fusion.vectra.ai/detection-models/library/misconfiguration/9090_external_internal.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.