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Remote Desktop 'An Internal Error Has Occurred' — RDP Connection Failed

Errornetwork

Overview

Fix Remote Desktop Protocol internal error that prevents connecting to remote computers, caused by RDP service issues, authentication failures, or network problems.

Key Details

  • The 'An internal error has occurred' message is a generic RDP connection failure
  • Remote Desktop requires the target machine to have Remote Desktop enabled and running
  • RDP uses port 3389 by default and requires network connectivity between the two machines
  • Network Level Authentication (NLA) can cause connection failures if credentials are mismatched
  • The RDP services (TermService, SessionEnv) must be running on the remote machine

Common Causes

  • Remote Desktop services not running or crashed on the target machine
  • RDP security settings (NLA, TLS version) mismatch between client and server
  • Firewall blocking port 3389 on the remote machine or network
  • RDP certificate expired or corrupted on the remote machine

Steps

  1. 1Restart the Remote Desktop client and try connecting again (transient error)
  2. 2On the remote machine: ensure Remote Desktop is enabled in Settings > System > Remote Desktop
  3. 3Verify RDP services: services.msc > Remote Desktop Services > ensure it is Running
  4. 4Check firewall: ensure port 3389 is open on the remote machine's firewall
  5. 5Delete saved RDP credentials: Credential Manager > Windows Credentials > remove the remote host entry, then reconnect

Tags

rdpremote-desktopinternal-errorconnectionnetwork

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windows-firewall-blocking-application

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Frequently Asked Questions

It is a catch-all error for RDP connection failures. The actual cause could be service crashes, authentication problems, certificate issues, or network connectivity. Check the remote machine's Event Viewer for specific error details.