Linux: How to fix SYN Flooding on TCP socket?

Tool/software: Linux

Hi there,

I am using SDK 4.0.0.4 with Linux Kernel v4.9.28 

I have changed the device tree and the U-boot to interface PHY over RMII and the PHY I am using is DP83640. 

When the Linux is booting it does detect the PHY and the Link is up. 

I have added an web-server app in the /usr/share/matrix-gui-2.0/apps/

  When I run one of the php files, that needs to open TCP socket with the web client and send data to be displayed on the web browser.

But I am getting the following error: 

TCP: request_sock_TCP: Possible SYN flooding on port 9001. Dropping request.

please, let me know if there are any settings to be changed in the ipv4.

Regards,

Mitesh