[Solved] GC 12.0.6 .dmg fails to mount in Sonoma 14.0

[matti]

GC 12.0.6 .dmg fails to mount in Sonoma 14.0 (Permission denied). A fresh download with Sonoma Safari from both GC servers fail.

Also a previously Ventura Safari GC 12.0.5 .dmg download fails to mount in Sonoma although no problem was in Ventura with that .dmg.

No problem with other .dmg images so far.

Screenshot 2023-09-27 at 13.19.24.png (187.67 KiB) Viewed 12670 times

[forum_adm]

I tried just a few seconds ago: Download with Safari. Mount works perfectly.

Permission denied indicates a security issue. Is the dmg in the downloads folder?

[forum_adm]

Is maybe the quarantine flag set?

[matti]

I used xattred.app to remove the quarantine flag and after that the .dmg mounted.

Maybe some teething issues with Sonoma 14.0? I have never needed to do this manually before. This is a clean Sonoma install and all other downloaded .dmg images have mounted OK.

Screenshot 2023-09-27 at 16.04.45.png (375.57 KiB) Viewed 12658 times

[Fotokunst]

I tested this too.
I see no issues.

[Fortissimo]

Hi,

identisches Problem. Download Safari, Sonoma 14.0 (23A344), bisher keine Problem.

[forum_adm]

The screenshot shows that the macOS did not grant access.

Please try a right mouse button click and select open. The quarantine flag is set by the local machine - not the server.

[matti]

Most .dmg open OK in Sonoma but I noticed that a .dmg with a license agreement pop-up have the same problem. Such as:

GraphicConverter, TinkerTool, DMG Canvas:

https://www.lemkesoft.de/en/products/gr ... r/download
http://www.bresink.com/osx/0TinkerTool/download.php
https://www.araelium.com/dmgcanvas

Also Spotify installer seems to fail with a similar error "An error occurred while trying to mount the downloaded Spotify disk image".

This error is not yet widely reported so I suspect it might be caused by my setup or maybe my oldish Mac mini 2018. In macOS 13.6 Ventura those .dmg mount OK.

This is a clean macOS 14.0 Sonoma install to an external disk.

I have unsuccessfully tried to fix this by:

Safe-boot
SMC and PRAM reset
Disk First Aid in Recovery mode is OK
Disable macOS internal Firewall
Right-click > Open .dmg
In another new user account
Safari download location from ~Desktop to ~Downloads
Safari "Open safe files after downloading" from OFF to ON
Download with Firefox instead Safari
Dirty macOS 13.6 -> 14.0 upgrade on an external disk
Reinstall macOS 14.0 Sonoma on top of the old install
Download a new macOS 14.0 Sonoma installer and do another clean install to an external disk

It seems the quarantine flag is not properly cleared. A workaround that fixes this is:

xattr -d com.apple.quarantine file.dmg

But I'd rather let macOS more gracefully automatically handle this.

[forum_adm]

Thanks for the hint.

I forward that details to the developer of DropDMG (the tool used for the creation).

[forum_adm]

You can view the reply here:

https://forum.c-command.com/t/dmgs-with ... ns/15494/2

So, Apple fix the issue with 14.1.