Port 28 Details
known port assignments and vulnerabilities
4 records found
||Palo Alto Networks Panorama HA (High Availability) uses these ports:
28/tcp - HA1 control link for SSH over TCP encrypted communication
28260/tcp, 28769/tcp - used for HA1 control link for clear text communication between HA peer firewalls
28770/tcp - Panorama HA1 backup sync port
28771/tcp - heartbeat backups
29781/udp - HA2 link to synchronize sessions, table forwarding, IPSec, ARP tables
AltaVista Firewall97 accepts connections on ports 26,27,28 and 29, this can be used to fingerprint the type of firewall in use.
Amanda trojan uses port 28/tcp.
Related ports: 26 27 29 28260 28770
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SANS Internet Storm Center: port 28
Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify
a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly
used port numbers for well-known internet services.
Well Known Ports: 0 through 1023.
Registered Ports: 1024 through 49151.
Dynamic/Private : 49152 through 65535.
TCP ports use the Transmission Control Protocol, the most commonly used protocol
on the Internet and any TCP/IP network. 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. Like TCP, UDP is used in combination with IP (the Internet Protocol)
and facilitates 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 and realtime gaming, 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.
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