Cryptomator installer is unable to write to hosts file

If the Cryptomator installer is unable to write to the hosts file, it will show a dialog as shown in the screenshot.

We’ve experienced that especially Office applications can’t handle WebDAV shares that are connected via Interestingly enough, a new host name (cryptomator-vault) fixes the issues, even though it’s also just mapped to We’ve covered this in our blog post under “Technical Details on Windows Mounting” in detail.

Please follow the instructions in the screenshot. This is the line that you have to add to your hosts file (located at C:\Windows\system32\drivers\etc\hosts): cryptomator-vault

You may have to open your text editor as an administrator in order to change the file. In some cases, you have to uncheck “read-only” in the file’s properties.


This “error message” reappears even after having edited the required line manually. May I suggest that the installation routine check the file “hosts” for the existence of this line? In case it is found, the “error message” is not needed, and confusion is minimised.

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