GabrielBrascher opened a new issue #5068:
URL: https://github.com/apache/cloudstack/issues/5068
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##### ISSUE TYPE
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* Bug Report
##### COMPONENT NAME
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~~~
UI
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##### CLOUDSTACK VERSION
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branch.
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4.15.0.0
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##### CONFIGURATION
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Information about the configuration if relevant, e.g. basic network,
advanced networking, etc. N/A otherwise
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New UI and noVNC enabled.
##### OS / ENVIRONMENT
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N/A
##### SUMMARY
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This issue is being hard for me to reproduce, but it happened sometimes.
The issue happens when resizing the console (noVNC) window. Error:
```
noVNC encountered an error:
Uncaught TypeError: Cannot set property 'scaleViewpoer' of undefined <https
URL>
```
I could not find anything concrete about what is triggering this issue. This
exception points to line
[systemvm/agent/noVNC/app/ui.js#L1216:30](https://github.com/apache/cloudstack/blob/280c13a4bb103dd748ec304bfe0714a148c24602/systemvm/agent/noVNC/app/ui.js#L1216).
However, it is the kind of issue that it happens of working many times in a
row (same network, browser, etc) and suddenly there is an issue.
It is important to note that the URL for the console, when inspecting the
page, always works.
In summary:
1. URL works always (sometimes failed when resizing, but opening URL on
another window brings the console)
2. DNS is working
3. Console System VM is working fine and presents properly the VM's console
I am not sure if this is a problem on the UI, or at another point, but the
exception is raised at [UI.rfb.scaleViewport =
this.fullScreen](https://github.com/apache/cloudstack/blob/280c13a4bb103dd748ec304bfe0714a148c24602/systemvm/agent/noVNC/app/ui.js#L1216):
```
toggleFullscreen() {
this.fullScreen = !this.fullScreen
UI.rfb.scaleViewport = this.fullScreen
UI.updateFullscreenButton(this.fullScreen);
UI.focusOnConsole();
},
```
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