My computer is connected to internet through wifi and to board through ethernet cable. Please suggest.
Your board is not connected to the internet. You only have a direct connection to your PC. Can you connect your board to a port on your router using the Ethernet cable?
You then need to find the new (DHCP assigned) IP address of your board and browse to it instead of http://192.168.2.99.
You can find the IP address in a few ways. You may be able to use the hostname of your board http://pynq
You may be able to ping pynq from your PC.
You can connect a USB terminal to your board and run ip a
You can log in to your router and find the IP address of the board.
Cathal
Cathal