Check below points,
If still there are issues, please put full snap of VS configuration.
I have attached snaps here. It shows http profile and SNAT settings. Also 2nd snap shows statistics status under pool. If there are some numbers then it ,means requests are hitting F5 VS and F5 is forwarding requests to backend pool members.
Hope it helps you!
Hi rifki, you configuration seems right prima facie and answer for you question "how do you connect the client to the virtual server?" is by typing in internet browser "http://192.168.42.254" and also cross-check via command "telnet 192.168.42.254 80" for success by client machine.
As you have VS using private IP, you need to do telnet test from the system from where VS IP will be reachable. e.g LAN system. Just put below command from cmd,
telnet 192.168.42.254 80
And see if you're able telnet it. Also have you checked the other settings that i've mentioned in my earlier comments.