An error occurred while executing the plugin

Hi all,

Starting a few days ago, I’ve noticed that my Custom GPT Actions consistently fail without ever reaching my server. These same Actions used to work fine for months.

:magnifying_glass_tilted_left: What’s happening:

  • The GPT hangs for over a minute when the Action is triggered.

  • Eventually, it fails with the message:
    An error occurred while executing the plugin.

  • Most importantly, no request ever reaches my server — no logs, no DNS lookup, nothing.

  • I’ve tried:

    • Multiple different domains (with and without HTTPS)
    • Two completely different servers
    • Super simple GET endpoints (?hashtag=travel) that work fine outside of GPT (tested in browser and curl)

:white_check_mark: What I’ve ruled out:

  • This only happens within Custom GPTs — the endpoints are fully reachable otherwise.
  • I double-checked server access logs — no trace of incoming requests from OpenAI’s infrastructure.
  • I suspect it might be a DNS issue or internal timeout before the request even goes out.

:red_question_mark:What I’m wondering:

  • Has OpenAI introduced any new restrictions on outbound Action calls?
    (There is a new “Recommended Model” section now…)
  • Are certain domains, IPs, or DNS providers being blocked or filtered?
  • Is there any way to debug these failures more deeply from the GPT side?

:paperclip: I’ve attached a screenshot of the error for context.

Any help or confirmation would be appreciated — happy to DM my domain/server details if needed.