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Port Number 4051/tcp | What is Port 4051/tcp?

Information about cppdp Port 4051/tcp

A Software Port (usually just called a 'port') is a virtual data connection that can be used by programs to exchange data directly, instead of going through a file or other temporary storage location. The most common of these are TCP and UDP ports which are used to exchange data between computers on the Internet. Port 4051/tcp uses the cppdp protocol for service type cppdp. A malformed request to port 4051/tcp is known to cause denial of service attacks.



In the TCP and UDP protocols used in computer networking, a port is a special number present in the header of a data packet. Ports are typically used to map data to a particular process running on a computer. Port numbers can occasionally be seen in the URLs of websites. By default, HTTP uses port 80 and HTTPS uses port 443, but a URL like http://www.MyCompany.com:8000/ would try to connect to an HTTP server on port 8000 instead. Port 4051/tcp is used for the cppdp service. An example would be http://www.MyCompany.com:4051/tcp/ when accessed by a web service. Port 4051/tcp may be used for several services including Cisco Peer to Peer Distribution Protocol and more. Port 4051/tcp is known to have vulnerabilities caused by trojans and remote code execution.

Note that not all transport layers use network ports; for example, although UDP and TCP use ports, ICMP does not. By default, the firewall should disallow traffic to port 4051/tcp until all security checks have been passed. If an application cannot listen on port 4051/tcp, the port 4051/tcp is already in use by another application causing the conflict.

Port Number: 4051/tcp (Windows 7/Windows Vista/ Windows XP/Windows Server family)
Cisco Peer to Peer Distribution Protocol
Protocol Used : cppdp
Service Type : cppdp
Known Port 4051/tcp exploits: Yes
Known Port 4051/tcp Security Risks: Yes

Information on Port 4051/tcp: Windows 7/Vista/XP

Port 4051/tcp Information

  • Go to the command prompt (Start>Run>cmd)
  • Enter netstat -ano
  • You will get a report of Active Connections
  • Report includes: Protocol, Local Address, Foreign Address, State, PID
  • e.g.
    • Proto Local Address Foreign Address State PID
    • UDP 127.0.0.1:4051/tcp *:* 4051/tcp
  • Write down the PID (process identifier) associated with port 4051/tcp (Also note the Local Address, Foreign Address, Protocol and State.)
  • Next, start the Windows Task Manager
  • Select the Processes tab in Task Manager
  • Search for the PID you wrote down previously
  • netstat parameter -s displays per-protocol statistics. By default, statistics are shown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6

How to manually open Port 4051/tcp in Windows Firewall?

Windows Firewall may block port 4051/tcp by default. If you want to allow a program to communicate using Port 4051/tcp through the firewall, you can usually do that by selecting the required program on the Exceptions tab in Windows Firewall. However, sometimes the program is not listed in the Exceptions tab. In this case you need to open the port manually.

1.Open Windows Firewall by clicking Start, Control Panel, Security, and then Windows Firewall.

2.Click 'Allow a program through Windows Firewall'.

3.Click 'Add port'.

4.In the 'Name' field, type a friendly name for the port like 'Port-4051/tcp'.

5.In the 'Port number' field, enter the port number '4051/tcp'.

6.Select TCP or UDP, depending on the protocol required for port 4051/tcp.

Free Software Downloads: Windows 7/Vista/XP

How to scan a PC/network for cppdp port 4051/tcp vulnerabilities?
If you detect unusual port 4051/tcp activity or port 4051/tcp intrusion, you need to check for known security risks. Security risks are due to remote hacking attempts, trojans, malware and spyware present on the computer. Incorrect port 4051/tcp mapping, port 4051/tcp forwarding, or port 4051/tcp binding can cause vulnerabilities as well. A port scanner or network analyzer will detect open 4051/tcp ports used on a PC (or a network) and detect security threats. Other software tools like an IP scanner, open port 4051/tcp scanner, remote open port 4051/tcp scanner, open port scan tool or remote port check can be used. The software below is free or open source.

Free Online Port Scanner/Port Checker/Port Scan Test
Firewall Vulnerability Test Tool: Run Now
Network Security Scanner/Vulnerability Scanner/Port Scanner: Download Nmap