Connecting to a VM using Azure Bastion results in a small screen

Dylan Drudge 45

After updating to Firefox 134.0 and connecting to a VM using Bastion the resulting window seems to max out with a 20px height. I couldn't see any differences in the web socket messages being sent regarding size between Chrome and Firefox. Below is a screenshot of a vm with a web browser open, if you look close enough you can see the taskbar and other dash items. This wasn't an issue with Firefox 130.0 Screenshot 2025-01-14 at 11.09.55 AM

anashetty 2,040 Reputation points Microsoft Vendor

2025-01-16T16:22:53.6866667+00:00

Hi Dylan Drudge,

I hope you are doing well. Did you get chance to look at my response. If you have any further queries, please let me know.

Thank you.
Steven Drinovsky 10 Reputation points

2025-01-16T20:17:17.67+00:00

Same problem, two different machines, cleared cache and cookies no help
anashetty 2,040 Reputation points Microsoft Vendor

2025-01-16T20:42:03.61+00:00

Hi Steven Drinovsky,

This looks like a bug or compatibility issue with Firefox 134.0 that affects how Bastion's interface displays the height of the HTML body. You can report it to the Mozilla Firefox team here
You can downgrade to previous version Firefox 130.0 which was working fine until the bug is resolved.

Thank you
anashetty 2,040 Reputation points Microsoft Vendor

2025-01-17T19:55:21.5933333+00:00

Hi Dylan Drudge,

I hope you are doing well. Did you get chance to look at my response. If you have any further queries, please let me know.

Thank you.
Steven Drinovsky 10 Reputation points

2025-01-23T13:22:53.9533333+00:00

Looks like the issue is with the viewport class and removing position: absolute resolves the issue. Not sure if its a css problem or a rendering problem.
anashetty 2,040 Reputation points Microsoft Vendor

2025-01-23T17:21:53.5566667+00:00

Hi Dylan Drudge & Steven Drinovsky,

Azure Bastion officially support these below browsers. Other browsers might have worked before but may not work further or you may get any issues, these are the supported browsers for Windows and Mac. I suggest to use Microsoft Edge which is suitable.

Thank you.
Gregor H 0 Reputation points

2025-01-24T10:03:44.24+00:00

Hi,
Steven Drinovsky workarround works, but this isn't a solution, that code should be fixed by microsoft.
Mihail Yankov 5 Reputation points

2025-01-28T13:25:18.7033333+00:00

Another work-around is to remove the hight 15px; inline-style,
anashetty 2,040 Reputation points Microsoft Vendor

2025-01-28T19:00:43.93+00:00

Hi Gregor H & Mihail Yankov,

Azure Bastion officially support these below browsers. Other browsers might have worked before but may not work further or you may get any issues, these are the supported browsers for Windows and Mac. I suggest using Microsoft Edge which is suitable.

Thank you.

1 answer

Amira Bedhiafi 28,376 Reputation points

2025-01-14T20:14:22.7866667+00:00

Sometimes, outdated browser data can cause rendering issues. Try clearing the cache and cookies in Firefox to see if that resolves the problem.

Try to manually adjust the window size by dragging the edges. Sometimes, the window might not render correctly initially, but resizing it can help.

Also, have you tried launching Firefox in Safe Mode (with all extensions disabled) to see if the issue persists? You can do this by selecting "Restart with Add-ons Disabled" from the Help menu.

If you’re able to access the VM, check the display settings of the VM or adjust the resolution to see if a different configuration helps.
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Dylan Drudge 45 Reputation points

2025-01-15T17:09:10.03+00:00

It's not a browser settings issue, everyone at my org who's updated their Firefox to 134 now cannot use Bastion with Firefox. I tried safe mode and resizing to no avail, logging into the same machine on Chrome looks and works fine.

Manually changing the HTML Body style to height: 100% or height:100vh fixes it but has to be done with every session.

anashetty 2,040 Reputation points Microsoft Vendor

2025-01-15T19:50:57.4566667+00:00

Hi Dylan Drudge,

We have noticed that you have rated the previous response as not helpful, thank you for taking time and sharing feedback. We are looking further into the issue. Please let me know if you have any queries.

anashetty 2,040 Reputation points Microsoft Vendor

2025-01-15T20:25:06.49+00:00

Hi Dylan Drudge,

This looks like a bug or compatibility issue with Firefox 134.0 that affects how Bastion's interface displays the height of the HTML body. You can report it to the Mozilla Firefox team here You can downgrade to previous version Firefox 130.0 which was working fine until the bug is resolved.

If you have any further queries, please let me know.

Thank you
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Connecting to a VM using Azure Bastion results in a small screen

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