apache / apache/cloudstack

noVNC clipboard does not send Turkish characters correctly on Windows VMs (CloudStack 4.22)

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#12,095 2 comments 0 reactions 0 assignees View on GitHub
component:console-proxy Severity:Minor type:bug
Dominant language
Java
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Description

### problem

When using CloudStack 4.22 noVNC console, clipboard text containing Turkish characters is not transmitted correctly to Windows virtual machines.

"asdasdç"
Inside the Windows VM it appears corrupted:
"asdasd."

The issue only occurs with noVNC → Windows clipboard operations.
It does not occur on Linux VMs.
Typing manually sometimes works, but clipboard “Send” is consistently broken.

This suggests a missing or incorrect UTF-8 → Windows codepage conversion in the noVNC version included with the CloudStack 4.22 SystemVM.

### versions

CloudStack version: 4.22.0
System VM Template: systemvm64template 4.22 (fresh download)
Hypervisor: VMware ESXi 8.x
vCenter: 8.x
Browsers tested: Chrome, Firefox (same result)
Guest OS: Windows Server 2016 / 2019 / 2022 (all affected)

### The steps to reproduce the bug

1. Deploy a Windows VM in CloudStack 4.22
2. Open noVNC console → Clipboard
3. Paste the following UTF-8 text: "asdasdç"
4. Click Send Clipboard
5. Paste the text inside the Windows VM

Expected: Unicode characters should be transmitted correctly
Actual: Turkish characters appear corrupted or replaced with “?”

### What to do about it?

The noVNC version embedded in SystemVM may not properly handle UTF-8 clipboard transmission for Windows guests.
• CloudStack may need:
• An updated noVNC version inside the SystemVM
• A fix to clipboard handling for non-ASCII characters
• Unicode normalization before sending text to the RFB server

This issue appears similar to:
https://github.com/apache/cloudstack/issues/7335

Please investigate whether the current SystemVM noVNC build processes clipboard text incorrectly or lacks UTF-8 handling required for Windows VMs.

Contributor guide

Open the contributing guide

Research direction

Start with the noVNC clipboard path included in the CloudStack 4.22 System VM and reproduce the issue using the listed Turkish text on a Windows VM. Compare the behavior with Linux guests and the related issue 7335. Done means clipboard Send preserves non-ASCII characters in the affected Windows Server versions.

Written by the indexing model from the issue text.

Assessment

Domain
desktop, infrastructure
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Mostly clear
Newbie friendliness
48/100

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