CLAUDE MCP // Server 504 Gateway Timeout on Tool Calls

[Martin Traub]

Hi Outbrain API Team,

I'm experiencing an issue with the Amplify MCP Server and need your help to resolve it.

Setup:

• MCP Server URL: https://amplifymcp.outbrain.com/AmplifyMcp/mcp/
• Client: Claude Desktop (via npx mcp-remote)
• Authentication: Bearer token (Amplify API Token)

Issue: The connection initializes successfully and the tools list is returned correctly. However, every actual tool call (e.g. get-amplify-budgets-reports, get-amplify-campaigns-reports) results in a 504 Gateway Timeout from your nginx server.

What works:

• ✅ MCP Server initialization
• ✅ Tools list retrieval

What fails:

• ❌ All tool calls → 504 Gateway Timeout

Error details from logs:

• HTTP 504 returned by nginx at amplifymcp.outbrain.com
• Timeout occurs consistently on every data request
• Issue persists across multiple attempts over several hours

Could you please investigate whether there is a backend issue on your MCP server affecting tool call processing?

Thank you.

[Danielle Newman]

Hi Martin, 

Thanks for reaching out. 

Unfortunately, there is currently a known issue with Amplify MCP Server with Claude that is causing the 504 errors.

I've just followed up with the developer team regarding this issue and will let you know as soon as it's resolved.

Best regards,

Danielle

On Mon, 30 Mar 2026 at 17:02, Martin Traub <in...@smarter-phones.de> wrote:

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[Martin Traub]

Hi Danielle, 

thanks for your response. Can you tell me an appreciated timeline for this issue? It is an important topic for us.

Thanks a lot.

Regards,

Martin

[Danielle Newman]

Hi Martin,

The developers are working to resolve the issue but we are not sure exactly when it will be fixed.

All the best,

Danielle

To view this discussion visit https://groups.google.com/d/msgid/outbrain-amplifyapi/f8310305-207e-4449-992e-84eee5dfd3e0n%40googlegroups.com.

[Martin Traub]

Hi Danielle,

any news about this urgent topic?

Thanks!

[Danielle Newman]

Hi Martin,

I've just heard back from the developers regarding this, they made some improvements that should resolve this issue.

Please let us know if the issue persists, and I will inform them.

Best regards,

Danielle

To view this discussion visit https://groups.google.com/d/msgid/outbrain-amplifyapi/1b696457-c893-4251-bbfa-a081c888f79dn%40googlegroups.com.