Remote Desktop Client issue: Error Code 0x3 Extended 0x11

Question

Hi,
Am frequently getting RDP client issue:

Error code: 0x3

Extended error code: 0x11

Timestamp (UTC): 02/22/26 06:22:23 PM

This issue is happening once every 30 mins.

Can you please say what could be the causes?
It is not that the Administrator has forcefully disconnected.

Thanks,

Answer 1

Hello Raguraman, Srikrishnan,

Has your issue been solved? If it has, please accept the answer so that it could be spread further to those in need too. If not, is there anything I can help you with? Please let me know. :)

VP

Answer 2

Hello Raguraman, Srikrishnan,

A precise 30-minute interval likely indicates a protocol transport timeout rather than a random rendering crash. The 0x3/0x11 error pair on a strict timer is officially documented by Microsoft as a symptom of UDP transport failing to maintain its connection state through network address translation or firewalls, causing the Remote Desktop client to drop the connection when the UDP heartbeat fails.

To permanently resolve this, the best practice is to force the RDP session to utilize TCP exclusively or to adjust the Keep-Alive intervals to prevent the network hardware from dropping the connection. You must open the Registry Editor on the client machine and navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services\Client. Create a new DWORD (32-bit) Value named fClientDisableUDP and set its value data to 1. Also, on the session host server, navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\TermService\Parameters and ensure the KeepAliveEnable DWORD is set to 1, with the KeepAliveInterval DWORD set to a value like 10000. If you are operating within a strict corporate firewall, the UDP port 3389 might be dynamically closing after 30 minutes of perceived inactivity. Disabling UDP forces the fallback to the highly stable TCP transport, completely bypassing aggressive UDP timeouts. If the issue persists after applying these registry modifications and rebooting, this behavior is tied to a known Windows UDP transport bug currently under investigation by Microsoft engineering, in which case you should remain on the TCP fallback registry configuration until an official patch is released via Windows Update.

Hope this answer brought you some useful information. If it has, please consider accepting the answer so that other people sharing the same issue would benefit too. Thank you :)

VP

Answer 3

The error code 0x3 with extended error code 0x11 in Remote Desktop Protocol (RDP) can be indicative of various underlying issues. Here are some potential causes:

1. Network Connectivity Issues: Intermittent network problems can lead to disconnections or failures in establishing a stable RDP session.
2. Configuration Problems: Incorrect settings in the Remote Desktop configuration, such as authentication or encryption settings, can cause connection failures.
3. Port Conflicts: If another application is using the same port as RDP (default is 3389), it can lead to issues. You can check for port conflicts using the netstat command.
4. Server Load: If the Remote Desktop server is under heavy load or has reached its maximum number of allowed connections, it may reject new connections.
5. Firewall Settings: Ensure that the firewall settings on both the client and server sides allow RDP traffic through the necessary ports.
6. Certificate Issues: Corrupted or invalid certificates can also lead to connection problems.

To troubleshoot, you may want to check the server logs for any additional error messages or indications of what might be causing the disconnection. Additionally, verifying the settings and ensuring that the server is not overloaded can help resolve the issue.

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References:

• Troubleshooting RDP Client connection problems
• Intermittent connection failures when using Remote Desktop Protocol