Transmission Web UI

Medium Risk

TCP — File Transfer

Port Overview

Port Number 9091

Service Name Transmission Web UI

Transport Protocol TCP

Category File Transfer

Security Risk Medium

Port Range Registered (1024-49151)

What is Port 9091?

Port 9091 is the default web interface port for Transmission, a popular lightweight BitTorrent client available on Linux, macOS, and other platforms. The Transmission web interface allows remote management of torrents through a browser. It is also used by Prometheus Pushgateway for receiving pushed metrics from batch jobs.

TCP File Transfer Commonly Used

Security Considerations

Port 9091 (Transmission Web UI) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.

Recommendation: Keep the service updated. Monitor logs for unusual activity.

Related Ports — File Transfer

20 FTP Data 21 FTP Control 69 TFTP 82 XFER Utility 115 SFTP (Simple FTP) 117 UUCP Path 139 NetBIOS Session 152 BFTP