Software⏱️ 4 min read📅 2026-06-11

How to Fix: RDP Error: Because of an error in data encryption, this session will end. Please try connecting to the remote computer again."

Windows RDP encryption issue fix

Quick Answer: Check and update the Remote Desktop Protocol (RDP) version on your Windows 11 VM, as outdated versions can cause encryption errors.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🚀 How to Resolve This Issue
  3. 💡 Conclusion

The RDP error 'Because of an error in data encryption, this session will end. Please try connecting to the remote computer again.' is a frustrating issue that affects users trying to connect to Windows 11 VMs hosted on Proxmox root servers via Remote Desktop Protocol (RDP). This error can occur even when the connection is stable and functional for light usage, but fails under heavy load or network stress.

This issue can be particularly challenging because it doesn't provide clear information about the cause of the problem. However, by following a step-by-step approach to troubleshoot and resolve the issue, users can identify and fix the root causes of this error.

🔍 Why This Happens

  • The primary reason for this error is related to the timing problems caused by local and remote clocks being out of sync. This discrepancy can lead to issues with data encryption, causing the RDP connection to terminate unexpectedly.
  • Another potential cause of this error is related to the Linux host's iptables configuration. If the port forwarding rules are not properly configured or are inconsistent, it can lead to encryption errors and cause the RDP connection to fail.

🚀 How to Resolve This Issue

Configuring Timestamp Synchronization and iptables Rules

  1. Step 1: Step 1: Ensure that both the local and remote clocks are synchronized. This can be done by configuring NTP (Network Time Protocol) on both systems. On Proxmox, you can configure NTP by editing the /etc/ntp.conf file and restarting the ntpd service.
  2. Step 2: Step 2: Verify that the iptables rules for port forwarding are correctly configured. You can do this by checking the iptables logs to ensure that the packets are being forwarded correctly. If necessary, you can also use the `iptables -nvL` command to inspect the current ruleset.
  3. Step 3: Step 3: If the issue persists after configuring NTP and verifying iptables rules, try resetting the Linux host's network configuration to its default state using the `ip addr flush` command. This can help resolve any inconsistencies in the network settings.

Using a Third-Party RDP Client

  1. Step 1: Step 1: Install and configure a third-party RDP client on your local machine, such as TeamViewer or LogMeIn. This can help bypass any issues with the native RDP client.
  2. Step 2: Step 2: Connect to the Proxmox VM using the third-party RDP client. If the connection is successful, it's likely that the issue was related to the native RDP client.

💡 Conclusion

By following these steps and troubleshooting methods, users should be able to resolve the 'Because of an error in data encryption, this session will end. Please try connecting to the remote computer again.' error when trying to connect to a Windows 11 VM hosted on Proxmox via RDP. Remember to ensure that both local and remote clocks are synchronized, verify iptables rules for port forwarding, and consider using a third-party RDP client if necessary.

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