Hello,
1. Ensure that rpcallowip is set to the IP of your WordPress installation in CIDR notation.
2. Ensure that rpcbind is set to the public-facing IP of your wallet node. This tells the wallet to listen on the correct NIC.
3. If your wallet node is on a hosting provider, contact your hosting provider, and ask them to open their firewall for your server and for incoming TCP connections to your RCP port.
Hope this helps. Please let me know if you continue to face problems.
with regards