Port Number 1720 | What is Port 1720?
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 1720 uses the tcp/udp protocol for service type h323hostcall. A malformed request to port 1720 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 1720 is used for the h323hostcall service. An example would be http://www.MyCompany.com:1720/ when accessed by a web service. Port 1720 may be used for several services including H.323 Hostcall-- H.323 call setup protocol used by multimedia collaborative apps such as NetMeeting to establish and control a collaborative session. Session data transfer will use H.323 udp streaming (AKA: RealTime Protocol [RTP]). -- and more. Port 1720 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 1720 until all security checks have been passed. If an application cannot listen on port 1720, the port 1720 is already in use by another application causing the conflict.
Port Number: 1720 (Windows 7/Windows Vista/ Windows XP/Windows Server family)
H.323 Hostcall-- H.323 call setup protocol used by multimedia collaborative apps such as NetMeeting to establish and control a collaborative session. Session data transfer will use H.323 udp streaming (AKA: RealTime Protocol [RTP]). --
Protocol Used : tcp/udp
Service Type : h323hostcall
Known Port 1720 exploits: Yes
Known Port 1720 Security Risks: Yes
Information on Port 1720: Windows 7/Vista/XP
- 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
- Proto Local Address Foreign Address State PID
- UDP 127.0.0.1:1720 *:* 1720
- Write down the PID (process identifier) associated with port 1720 (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 1720 in Windows Firewall?Windows Firewall may block port 1720 by default. If you want to allow a program to communicate using Port 1720 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-1720'.
5.In the 'Port number' field, enter the port number '1720'.
6.Select TCP or UDP, depending on the protocol required for port 1720.
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