My Centos server has running the "ConfigServer Security & Firewall" and its blocking the Web3.js connection with Ethereum node. The functions calls returns: "Error: Invalid JSON RPC response:"

Any idea how could I avoid it? Thank you


I solved opening the TCP OUT 30303 (Ethereum listeners) and 8545 (JSON-RPC) ports.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.