PortScan Tool

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The PortScan tool is a very powerful tool to check open ports of a target machine. It can be accessed either using the Tools -> Network Tools menu or by right clicking a device in the left tree-view. The results of the PortScan are added into a Listview with the port number, a description (if available), a response (if there is any) and the time that a particular scan took. Additionally, there is a textbox at the bottom of the window, which displays more detailed information. The PortScan Dialog can be opened multiple times, so you can run multiple PortScans at the same time. For details see the screenshot below:


Figure 1: PortScanner Form


IP / Hostname

The hostname or IP you want to scan for open ports


Connect TimeOut

This value in milliseconds is used for send/receive operations on open ports. It is also used for a Timeout when trying to connect to ports.


Every Port in the Portlist

When this option is selected, all ports from a common list will be scanned. To view/edit this list, see the Portlist setup.


Selected Ports from the List

If this option is selected, only selected ports from the common Portlist will be scanned. To view/edit this list, see the Portlist setup.


All Ports from

This option is used to give a Range of ports to scan. This means to scan all ports from a Start value and an End value. By default, this is 1 to 65535, which means every possible port will be scanned.


Send Data to common ports

If enabled, the PortScan tries to send messages to found open ports. For example on Port 80, it tries to send a standard GET request.


Reverse Lookup

Use this function to get the DNS name of an IP (if possible).


Connections Slider

This slider will set the number of parallel connections that will be used for the PortScan. By default, this value is set to 10, which is rather low. You can increase this number from 1 to 250. Be careful with the high connection-scans (like 250). Some DSL Routers, or slow dialup links can be "killed" by such a high connection scan. This includes the scanning side as well as the side that is scanned!
However, more connections mean faster results, but also more data (traffic) per second.


PortScan

Hit this button to start the PortScan operation. Once started, you can abort it by clicking the Cancel button or closing the Window.


Cancel

Use this button to cancel a PortScan operation. Please be patient after you have clicked this button. Depending on how many connections you are using, it can take a while until all scans are stopped.


Portlist Setup

Use this button to view or edit the common Portlist. In this list, you will see well-known ports including a description and a checkbox for each port. Use the checkboxes to define which ports should be scanned during a "Selected Ports from the List" PortScan. See the screenshot below for more details:


Figure 2: PortScan List Editor Form


Save

Hit the save button to save changes (If you selected or deselected any ports).


Cancel

This will just do the same as if you close the window. Changes that were made will be discarded and the window will be closed.