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HomeDocker AppsDiagnose a port conflict in an application
Docker Apps6 min•Difficulty: Básico

Diagnose a port conflict in an application

Check the internal port, published port and any service already using it.

Equipo de documentación AnayilUpdated: 2026-10-10

Apply this guide to your situation

This answer covers “Diagnose a port conflict in an application”. Read it with the summary and confirm that the symptom and service match what you are experiencing. Available options can vary by plan and account setup.

  • Before changing anything, note what you expected, what happened and roughly when. Check whether the issue affects one page or the whole service.
  • Save the full error message and note recent changes. Hide passwords, access codes, personal data and keys before sharing screenshots or logs.
  • If a step requires administrator access, restarting services or editing server files, stop if you do not administer that server. Send support the service name, error and checks you have already made.

Likely-cause and resolution matrix

Follow a branch only when evidence supports it. A symptom may have more than one cause; do not change layers by guesswork.

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Prerequisites

  • The service definition, internal and external ports and full error message.
  • Keep the service identifier available and do not share credentials.

Important warnings

  • Portal labels and options vary by product and provider. This guide explains the general process and does not confirm that the action is available in Anayil Panel.
  • Before confirming purchases, DNS changes, cancellations or deletions, review consequences, charges and recovery options.

Step-by-step walkthrough

1. Understand the situation

A container can listen on one internal port and publish another on the host. Confirm both values in the application definition before editing.

2. Follow the process carefully

Check whether another service uses the external port and review provider-managed network rules. Choose an allowed port without exposing administrative services to the Internet.

3. Check the result

Test the application at the expected address and check startup logs. If its status changes to an error, restore the previous value and request a review.

Troubleshooting & Solutions

The expected option or status does not appear

Root cause: The service, plan, role or registrar may differ from what the guide assumes.

Resolution: Do not repeat the action. Confirm the provider, service and permissions, then contact support with the case reference.

Rollback and recovery plan

If you have not confirmed the change, go back and keep the current information. If you already confirmed it, do not make successive changes to compensate: save the confirmation and ask the provider for the recovery process for this service.

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