Comprehensive and Detailed Explanation From Exact Extract of Forescout Platform Administration and Deployment:
According to the Forescout Quick Installation Guide and official port configuration documentation, SecureConnector for Windows uses TCP port 10003, and the management packets should be captured from the host IP address reaching the management port (not the monitor port). Therefore, the correct command would use tcpdump filtering for tcp port 10003 traffic reaching the management port.
SecureConnector Port Assignments:
According to the official documentation:
SecureConnector Type
Port
Protocol
Function
Windows
10003/TCP
TLS (encrypted)
Allows SecureConnector to create a secure encrypted TLS connection to the Appliance from Windows machines
OS X
10005/TCP
TLS (encrypted)
Allows SecureConnector to create a secure encrypted TLS connection to the Appliance from OS X machines
Linux
10006/TCP
TLS 1.2 (encrypted)
Allows SecureConnector to create a secure connection over TLS 1.2 to the Appliance from Linux machines
Port 2200 is for Legacy Linux SecureConnector (older versions using SSH encryption), not for Windows.
Forescout Appliance Interface Types:
Management Port - Used for administrative access and SecureConnector connections
Monitor Port - Used for monitoring and analyzing network traffic
Response Port - Used for policy actions and responses
SecureConnector connections reach the management port, not the monitor port.
Troubleshooting SecureConnector Connectivity:
To verify that SecureConnector management packets from a Windows host are successfully reaching CounterACT, use the following tcpdump command:
bash
tcpdump -i [management_interface] -nn "tcp port 10003 and src [windows_host_ip]"
This command:
Monitors the management interface
Filters for TCP port 10003 traffic
Captures packets from the Windows host IP address reaching the management port
Verifies bidirectional TLS communication
Why Other Options Are Incorrect:
A. tcp port 10005 from host IP reaching monitor port - Port 10005 is for OS X, not Windows; should reach management port, not monitor port
B. tcp port 2200 reaching management port - Port 2200 is for legacy Linux SecureConnector with SSH, not Windows
C. tcp port 10003 reaching monitor port - Port 10003 is correct for Windows, but should reach management port, not monitor port
D. tcp port 2200 reaching management port - Port 2200 is for legacy Linux SecureConnector, not Windows
SecureConnector Connection Process:
According to the documentation:
SecureConnector on the Windows endpoint initiates a connection to port 10003
Connection is established to the Appliance's management port
When SecureConnector connects to an Appliance or Enterprise Manager, it is redirected to the Appliance to which its host is assigned
Ensure port 10003 is open to all Appliances and Enterprise Manager for transparent mobility
Referenced Documentation:
Forescout Quick Installation Guide v8.2
Forescout Quick Installation Guide v8.1
Port configuration section: SecureConnector for Windows
