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Troubleshooting Guide

This document provides troubleshooting tips for common issues encountered when setting up and using the wordpress-mcp plugin.

Node.js Version Issues with MCP and nvm

Due to a bug in the MCP server implementation, you may encounter issues connecting to your MCP enabled WordPress site if you have multiple Node.js versions installed via nvm (Node Version Manager).

The MCP server requires a specific version of Node.js to function correctly, and if you have older versions installed, npx may default to using one of those versions instead of the one set as default in your nvm configuration.

You can resolve this by ensuring that the correct npx version is being used to make the connection.

Use the following command to check which version of npx is being used:

which npx

The output should point to the installed npx binary configured as your computer's default.

/Users/username/.nvm/versions/node/v22.16.0/bin/npx

This must be version 22 or later.

You can then update your MCP server configuration to use the full path for npx. Below is an example configuration for Cursor:

{
	"mcpServers": {
		"wordpress-mcp": {
			"command": "/Users/username/.nvm/versions/node/v22.16.0/bin/npx",
			"args": [ "-y", "@automattic/mcp-wordpress-remote@latest" ],
			"env": {
				"WP_API_URL": "https://example.test/",
				"JWT_TOKEN": "{your_jwt-token-here}",
			}
		}
	}
}

Local development environments and SSL

If you use a local development environment with a self-signed SSL certificate, you may encounter issues with the MCP server connecting to your WordPress site.

You can work around this by setting the NODE_TLS_REJECT_UNAUTHORIZED environment variable to 0 in your MCP server configuration. This will disable SSL certificate validation, allowing the MCP server to connect to your local WordPress site without issues.

{
	"mcpServers": {
		"wordpress-mcp": {
			"command": "/Users/username/.nvm/versions/node/v22.16.0/bin/npx",
			"args": [ "-y", "@automattic/mcp-wordpress-remote@latest" ],
			"env": {
			    "NODE_TLS_REJECT_UNAUTHORIZED": "0",
				"WP_API_URL": "https://example.test/",
				"JWT_TOKEN": "{your_jwt-token-here}",
			}
		}
	}
}