Why does XMRig say "connect error" when connecting to the pool?

XMRig says “connect error” when it cannot open a network connection to your mining pool—the service that combines your mining work with other miners’ work. The message alone does not tell you why, but the words beside it usually help you distinguish a wrong address from a blocked port, a network problem, or a pool outage.

Start with the full error message

Look at the XMRig log lines immediately before and after “connect error.” Note the pool address, port number, and any extra error text. A port is the numbered connection point a service uses.

Common clues include:

• “Connection refused”: The destination, or something along the route, actively rejected the connection. The pool may not be listening on that port.
• “Connection timed out”: XMRig did not receive a response in time. A firewall, an unreachable server, or a pool outage could explain it.
• “No route to host” or “Network is unreachable”: Your computer cannot find a working network path to that destination.
• A hostname or DNS error: Your computer cannot translate the pool’s name into its network address. DNS is the system that performs that lookup.

These are clues, not definite diagnoses. Save the full error rather than troubleshooting from “connect error” alone.

Check the pool address and port first

Compare your settings with the pool’s current setup instructions. Old tutorials can list retired servers or ports.

In XMRig’s configuration file, check the relevant entry under pools:

• url should contain the correct pool hostname and port, usually in the form hostname:port.
• Remove accidental spaces and check for typing mistakes.
• Make sure the port is for mining connections, not the pool’s website.
• Confirm whether that port requires tls.

TLS encrypts the connection between XMRig and the pool. Your TLS setting must match the selected port. A mismatch may produce a handshake or connection-closed error rather than the exact words “connect error.”

Also check startup commands. Command-line options or a different configuration file may mean XMRig is not using the settings you just edited.

Test whether your network can reach the pool

A pool website loading in your browser does not prove its mining port is reachable. Websites and mining servers can use different addresses and ports.

On Windows, you can test the exact destination in PowerShell:

Test-NetConnection pool.example -Port 3333

Replace pool.example and 3333 with your pool’s actual hostname and port. Look for TcpTestSucceeded. A successful result shows that a basic connection works; it does not confirm the mining login or TLS settings.

If the test fails:

• Check that your internet connection works.
• Review firewall or security-software logs for a block.
• Check whether a VPN or proxy is changing your connection.
• If permitted, test from another network you control.

Do not disable your protection wholesale. Only allow a verified XMRig installation where you have permission to mine. Do not bypass workplace or school restrictions.

Separate an outage from a login problem

Check the pool’s official status information. If it offers another documented server or port, try that. Avoid random replacement addresses posted by strangers.

An invalid wallet address or worker setting normally causes a login rejection after a connection opens. Changing your wallet, CPU threads, or mining speed is therefore not the first fix for a basic connection failure.

The bottom line

Start with the complete error, then verify the pool address, port, and TLS setting. Test that exact connection before changing unrelated mining settings. If the pool is offline, wait or use an officially documented alternative.