Apache Kafka, a distributed streaming platform, uses TCP port 4040 for its web user interface. Additionally, the port is used by the Cloudera Manager, a software that manages Apache Hadoop clusters, for its Service Monitor web UI. Furthermore, Spark's web UI also runs on port 4040 by default. However, it's important to note that these are not standard uses, and the port's usage may vary depending on the specific software configuration.
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