troubleshooting changedagents-and-tools/mcp-tunnels/troubleshooting
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77<Note>
8 MCP tunnels are in research preview. [Request access](https://claude.com/form/claude-managed-agents) to try them.
8 MCP tunnels are in research preview. [Request access](https://claude.com/form/mcp-tunnels) to try them.
99</Note>
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1111A request through the tunnel can fail at one of three layers; diagnose them in order: the outbound connection to the [tunnel edge](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/concepts#components), the [inner TLS](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/concepts#components) from Anthropic to your [proxy](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/concepts#components), then routing and IP validation toward the [upstream MCP server](https://platform.claude.com/docs/en/agents-and-tools/mcp-tunnels/concepts#components).
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