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2 Ways to Discover the Blocked Ports on Cisco Router

By default, the network router and Windows open various ports used for the Web and Internet applications, including browsing, emails, FTP file transmissions and other required tasks. If you require using other office applications that need the Internet connection, you should open them manually. If you require checking closed or disabled ports on the Cisco router, you will discover the device, possibly doesn’t offer a means of doing that. However, you can check the blocked ports by confirming which ones are active or open. Before contacting the Cisco customer support number, follow these instructions:

Using the Netstat Command

  1. Press Windows + R keys to open the ‘Run’ box. Input ‘cmd’ into the ‘Open’ box, and then click the ‘Enter’ button. If the User Account Control notification appears, click the ‘Yes’ button. Now, a command prompt screen displays.
  2. Enter the ‘netstat -a’ at the command prompt window and click the ‘Enter’ button. After a few seconds, all of the ports open up on the system. Find all entries that contain the ‘CLOSE-WAIT,’ ‘ESTABLISHED’ or ‘TIME-WAIT’ value in the ‘State’ header.
  3. These ports are also opened up on the Cisco router. Other entries in the list may contain the ‘LISTENING’ status value. These ports are enabled on the system but may or may not be activated on the router.

Seeing Open Ports on the Router

  1. Open your web browser and type the IP address in the address bar for the Cisco router’s sign in page and press the ‘Enter’ button. If you don’t know the default IP used to access the router’s sign in page, try to prefer the user manual guide for the device. Sometimes, the default IP address is ‘,’ ‘’ or it’s similar.
  2. Input the Cisco router’s administrator username and password and click the ‘Enter’ button. Otherwise, click the ‘Log In’ or ‘Sign In’ button. Check the user manual or guide if you don’t know the default login credentials or didn’t change the default username and password.
  3. Click on the ‘Port Forwarding’ or ‘Gaming’ or ‘Applications’ or other similar link or tab in the router’s control panel.  After clicking the link, a new page appears all of the application- related ports open on the Cisco router.


If you discover open ports that you don’t identify as being used by real programs, they may have been enabled by the spyware and malware applications. However, if you find allowed ports and can’t fix the protocol or application that allowed them, try to run a complete virus and malware scan to make sure no Trojan programs or other malicious software is available on the PCs.  If you can’t recognize that which ports are open on the router, you can take the experts help by dialing the Cisco router tech support phone number to check the ports they're closed on the Cisco router.

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