Skip to main content
Question

MCP Server: 404 error

t.los

What I’m doing wrong? I generated some Flutter code (with the help of visual code/copilot and the Figma MCP server) from my Figma design:
 

class IPhone161 extends StatelessWidget {
  // Bild-URLs vom lokalen MCP-Server
  static const imgScreenshot202505181133481 = 'http://localhost:3845/assets/40302311985739cf5b0d629966628c418a2cb3ae.png';
  static const imgEllipse1 = 'http://localhost:3845/assets/5747de95ba735346045eb9f07a9e21c55e00f7b8.svg';
  static const imgFrame = 'http://localhost:3845/assets/2d63044c4aee77ef3b5702988be5cbcb4764e5a5.svg';

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: Color(0xFFFFFFFF),

But if I start the app, it is blank. Then I tried to access the asset (PNG file) directly from my browser and got a 404 error (This localhost page can’t be found). Seems that the MCP Server can’t serve the assets?

MichelyWeb

Same problem using Claude Code with official Figma MCP. The assets from the localhost URL can not be loaded.

Jesse H
  • Jesse H
  • New Member
  • June 25, 2025

I’m running into the same issue with Cursor + Claude Sonnet 4. The MCP server has a green light and appears to be working otherwise.

George Clark
1 person likes this
  • George Clark
    George Clark
Celine_
Figmate
  • Celine_
  • Community Support
  • June 25, 2025

Hi everyone! Thank you for flagging this and sorry for the trouble!

Here are a few steps to try first:

  • Close any unused Figma tabs

  • Browser: Fully quit and reopen Figma in a new browser window, or try clearing your cache

  • Desktop app: Force-quit and restart the app. If the issue continues, try clearing the cache.

If the issue persists, please submit a bug report. This will be helpful for our team to investigate the root cause of the issue.

In the form, please include:

  • Your Figma email address
  • The file link with "can edit" access granted to support-share@figma.com (this won’t affect your billing)

  • A screen recording showing all steps and the full window

  • Console log (You can follow these steps to export them).

Thank you!

George Clark

Same problem using Claude Code with official Figma MCP. The assets from the localhost URL can not be loaded. +1

[I have run through all those steps above, and still nothing on 3845]

Ryan Beymer

Getting the same thing here. Walked through the mentioned steps and didn’t seem to help. 

If I hit the url with postman (http://127.0.0.1:3845/sse), it connects and I can see it’s ready to start spitting things out https://share.bloomerang.com/NQumyPvR 

Using VS code as my IDE, this displays in the “output” tab with the “Figma Dev Mode MCP” selected: 

2025-07-01 22:47:22.210 [info] Connection state: Running
2025-07-01 22:47:22.217 [info] 404 status sending message to http://127.0.0.1:3845/sse, will attempt to fall back to legacy SSE
2025-07-01 22:47:22.273 [info] Discovered 4 tools

 

Celine_
Figmate
  • Celine_
  • Community Support
  • July 3, 2025

Hey ​@George Clark , I can see you have also already reached out to the support team, thank you! They're ready to dig deeper as soon as they hear back from you. Feel free to reply to your existing ticket (#1406516) whenever you're ready. It'll reopen automatically.
Same for ​@Jesse H , your support ticket is #1402760.

For everyone else: if you're still running into this issue, please submit a bug report to the support team. That’s the best way for our technical quality team to investigate and help get to the bottom of it. Thanks everyone! 🙏🏼

Reply


Terms & ConditionsCookie settingsAccessibility statement

Cookie policy

We use cookies to enhance and personalize your experience. If you accept you agree to our full cookie policy. Learn more about our cookies.

 
Cookie settings