- Are you trying to ping a hostname in Internet or a hostname which inside your network?
- When you try to ping the FQDN does it resolve to an IP address or it does not even resolve?
- If it resolves and you are observing timeout in pings then you can verify if the firewall has the correct policy and route for the communication.
- If the IP is not resolving then try to ping the DNS server from the client PC and check the reachability. You will need to have policy to allow the DNS communication from SSL VPN interface to the destination interface.