Port 9091 Details

known port assignments and vulnerabilities
threat/application/port search:
Port(s) Protocol Service Details Source
9091 tcp,udp apps Citrix NetScaler appliance Command Center Server uses ports 9091, 9092, 9094 TCP for communication between client and server, mapping/discovery/administration/configuration management.

Championship Manager 4

Transmission (BitTorrent client) Web Interface, Eyemax DVS-9000 also use this port (TCP)

Prometheus (open-source system monitoring) uses these TCP ports:
9090 - Prometheus server
9091 - Pushgateway
9093 - Alertmanager
9094 - Alertmanager clustering
9100-9563 - Prometheus Exporters
See: Prometheus default port allocations on GitHub.
9091 tcp Openfire Administration Console (SSL Secured) (unofficial) Wikipedia
9091-9092 tcp,udp applications Championship Manager 4 Portforward
9091 tcp,udp xmltec-xmlmail xmltec-xmlmail IANA
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Related ports: 9090  9092  9093  9094  9112  

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External Resources
SANS Internet Storm Center: port 9091

Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.

TCP ports use the Transmission Control Protocol. TCP is the most commonly used protocol on the Internet and any TCP/IP network. Whereas the IP protocol deals only with packets, TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP.

UDP ports use the Datagram Protocol, a communications protocol for the Internet network, transport, and session layers. Like TCP (Transmission Control Protocol), UDP is used with IP (the Internet Protocol) and makes possible the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming, where dropping some packets is preferable to waiting for delayed data.

When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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