Below is the list of blog posts with the “Log analysis” tag.

Your firewalls already record allowed and denied connections and policy changes. Each vendor logs them in its own format. This post shows you how to get those records into one searchable structure, with working configurations for the most common sources. A firewall log analyzer is a tool that collects logs from firewalls, parses each vendor’s log format into structured fields, and stores the results in one place for searching, alerting, and reporting.

Server log analysis turns the raw event records your Windows and Linux servers already produce into security detections, audit evidence, and troubleshooting answers. NXLog Agent and NXLog Platform provide that pipeline: collection and parsing at the source, centralized storage and search on top. Every server you run writes down what happens to it: who logged in, which services started, what the web server returned, why a process crashed. Attackers know this too.

A source IP address on its own answers almost none of the questions an analyst asks at triage. Did this login attempt come from a country where we have no users? Is the source a residential connection or a hosting provider? Log enrichment with GeoIP answers these questions before anyone has to ask them by resolving each IP address against a geolocation database and writing the results — country, city, coordinates, network owner — directly into the event record.

Teams usually choose a log analysis tool by comparing vendors. The more costly decision sits one level up: the category of tool. The wrong choice there surfaces months later as a source you can’t collect, data you can’t normalize, or a per-gigabyte bill for logs you never needed. Log analysis tools collect, parse, store, search, and visualize log data so teams can detect threats, investigate incidents, and troubleshoot systems. The term spans four distinct categories — collection agents, processing pipelines, storage and search engines, and analysis platforms — that each handle a different job in the same workflow.

Ever tried to analyze IIS logs manually across dozens of web servers during a security incident? If so, you know the challenge: massive log files across multiple systems, cryptic log entries, and no easy way to correlate events. When running Microsoft Internet Information Services (IIS) across large infrastructures, log data accumulates quickly, increasing the risk of missing critical events. IIS log analysis software is designed to collect, parse, and analyze IIS web server logs to monitor activity, troubleshoot performance issues, detect threats, and demonstrate compliance.