connection resets happening to web services servers when clients uses load balanced url. Need help to capture traffic.

You can get the BIG-IP to log why it's sent RSTs and that might help. See SOL13223: Configuring the BIG-IP system to log TCP RST packets

As another option this tcpdump command will only look for RST packets - this should show where the rst is coming from.

To view all packets that are traveling through the BIG-IP system that contain the RST flag, type the following command:
tcpdump 'tcp[tcpflags] & (tcp-rst) != 0'

Hope this helps,

N