Remote Desktop Protocol (RDP) is a vital tool for accessing other systems over a network. When it works, it provides seamless access across devices, but sometimes frustrations arise, particularly when switching between platforms. A common issue faced by many users is that RDP connects successfully from PC to PC, but when attempting to connect from a Mac to a PC, it fails with Error Code 0x204. This article will help you understand what causes this issue, and guide you through proven ways to fix it.
Understanding Error Code 0x204
Error Code 0x204 is a connection error that occurs when the Microsoft Remote Desktop client on macOS fails to establish a session with a Windows machine. This can be particularly confusing because the same session works fine from a Windows PC. The error typically appears as:
“We couldn’t connect to the remote PC. Make sure the PC is turned on and connected to the network, and that remote access is enabled. Error code: 0x204.”
While the message is vague, the error is usually linked to configuration mismatches between the macOS RDP client and the settings on the Windows machine.
Common Causes of Error Code 0x204
Several factors can contribute to this issue. Below are the most frequent root causes:
- Network Issues: The Mac and PC aren’t on the same network, or a firewall is blocking the connection.
- Incorrect Credentials: Using the wrong username format or password can block access.
- Remote Access Misconfiguration: Remote Desktop is not properly enabled on the Windows PC.
- TLS or Encryption Settings: The macOS RDP client may not support the outdated encryption levels configured on the target PC.
- Exporter Mode is Disabled: Some group policies may restrict RDP access to specific clients or network types.
Knowing what may be causing the issue helps narrow down the troubleshooting steps.
Step-by-Step Troubleshooting Guide
To fix Error Code 0x204 on Mac when connecting to a Windows PC, follow these steps carefully:
1. Verify Remote Desktop is Enabled on the Windows PC
On the target Windows system:
- Open Settings > System > Remote Desktop.
- Enable “Remote Desktop” and confirm the PC name shown there.
- Ensure users have permission to connect remotely.
2. Confirm Connectivity
Test that you can reach the Windows PC from your Mac:
- Use
pingin Terminal (macOS) to check network connection. - Ensure no VPN or firewall is blocking traffic.
3. Check Username Format
Mac RDP clients are particular about username formatting. Try these formats on login:
- PCName\Username
- DomainName\Username
Incorrect format is a common culprit behind Error Code 0x204.
4. Validate TLS Encryption
In some versions of Windows, newer encryption settings prevent older or non-Windows RDP clients from establishing a session. On the Windows PC:
- Open Local Group Policy Editor:
gpedit.msc - Navigate to Computer Configuration > Administrative Templates > Windows Components > Remote Desktop Services > Remote Desktop Session Host > Security.
- Set “Require use of specific security layer for remote (RDP) connections” to RDP.
- Set “Require user authentication for remote connections by using Network Level Authentication” to Disabled.
After saving these changes, reboot the Windows PC.
5. Update the RDP Client on macOS
The Microsoft Remote Desktop client for macOS is periodically updated. Make sure you’re using the latest version by checking the Mac App Store. Many compatibility issues are resolved with newer releases.
Alternative Solutions
If all else fails, try these additional measures:
- Try a Different RDP Client: Apps like Royal TSX or Jump Desktop sometimes handle RDP connections better on macOS.
- Enable IPv4 Only: Disable IPv6 on both devices to test IPv4 connectivity stability.
- Create a New Windows User: Sometimes, user profile corruption can block RDP access.
Conclusion
The Error Code 0x204 when connecting via RDP from Mac to PC is a frustrating issue, but it’s commonly related to misconfigurations or compatibility problems. By carefully checking remote access settings, ensuring encryption compatibility, and validating your connection credentials, you can resolve this issue effectively.
Given the frequent use of cross-platform remote desktop connections in modern IT environments, solving these issues is not just about convenience—it’s essential for maintaining productivity and accessibility.