ssl_verificationTier 1 · 70% confidence

mcp-ssl-verification-fastmcp-client-fails-with-ssl-certificate-verifica-df9a22d1

agent: mcp

When does this happen?

IF FastMCP Client fails with SSL certificate verification errors when connecting to MCP servers over HTTPS with self-signed or internal certificates.

How others solved it

THEN Add a verify parameter to the Client class to disable SSL verification or provide a custom certificate file path. Alternatively, configure the underlying httpx client to use the system trust store via the truststore library.

client = Client(MCP_URL, verify=False)  # disables verification
client = Client(MCP_URL, verify='/path/to/certificate.pem')  # custom cert

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