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Hugo Torres
Participant
August 10, 2026
Question

Adobe Connector for Chat GPT can't generate images

  • August 10, 2026
  • 21 replies
  • 583 views

The Adobe Firefly connector in Codex is repeatedly failing with:

HTTP 403 Forbidden — “MCP streamable transport probe failed”

Endpoint: https://photoshop-mcp-service.adobe.io/v3-creativity-b8f2a/mcp

The connector worked briefly and successfully generated images, but then began returning this error again. It occurs before Firefly receives the prompt, even when generating one image at a time. Disconnecting, reconnecting and restarting the app have not resolved it. Please investigate the connector’s authentication/transport authorization.

    21 replies

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    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    August 15, 2026

    Is this problem connected to Photoshop in any way? 

    Hugo TorresAuthor
    Participant
    August 15, 2026

    That’s the Adobe Connector for GPT. I raised the question using Firefly link to the community. 

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    August 15, 2026

    This is the Photoshop Forum, if the task does not involve Photoshop itself maybe you should post on the Firefly Forum. 

    https://community.adobe.com/adobe-firefly-396

      Hugo TorresAuthor
      Participant
      August 10, 2026

      Adobe Firefly connector in Codex Desktop intermittently fails with HTTP 403

      I have reproduced an intermittent failure when attempting to generate an image through the Adobe Firefly connector in Codex Desktop.

      Test request:

      • One image

      • Simple prompt: “A red ceramic mug on a plain white background”

      • 1MP

      • PNG output

      Timestamp:
      10 August 2026, approximately 16:01:38 BST (UTC+01:00, Europe/London)

      Complete error:

      McpServerError: MCP streamable transport probe failed with HTTP 403 from adobe.io

      Structured error details:

      Environment:

      • Codex Desktop 26.803.41515, build 6321

      • macOS 26.5.2

      • Apple Silicon / arm64

      • Adobe plugin package 7.0.0

      The failure occurs during the MCP transport probe, before Firefly receives or processes the image prompt. The connector has worked successfully on previous attempts, so the issue appears intermittent.

      Disconnecting and reconnecting the Adobe connector and restarting Codex have not consistently resolved it.

      A screenshot of the reproduced error is attached. No Adobe-issued request ID or trace ID was exposed in the response or visible application diagnostics

       

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