After installing the recent version from the APT repository (2.13.6), I got a message upon connecting to a server that I didn't manage to reproduce afterwards, something like:
"IPv6 cannot be safely disabled on Linux in order to make the network lock effective. This can make your IPv6 address leak if your provider supports IPv6. This setting can be changed in Preferences / Advanced / IPv6."
This sounds worrying to me, but I don't understand the message. The quoted setting is set to "disable". Does this safely disable my IPv6 or not?
I know how to disable IPv6 on the kernel level, but I'm not sure whether that is necessary or not. Sorry that the above message is not an exact quote, it's just what I remember from it. It didn't appear again, which is even more worrying to me...
Edit: Here is the exact message that I copied from Github:
IpV6Warning = "IPv6 detected.\n\nThis can cause data leak ONLY if your ISP provides IPv6 support.\nCurrently our software can't disable and restore safely IPv6 on Linux.\nIf you continue, IPv6 detection will be disabled. You can re-enable it in Preferences -> Advanced -> IPv6.\n\nContinue?";
This message is confusing because first it says that "our software can't disable (...) safely IPv6 on Linux", then it talks about IPv6 detection, and the actual settings entry is about disabling the use of IPv6 altogether... So I assume that this just means that "we can't forward IPv6 on Linux, so we will disable it completely"? Sounds ok to me that way.
Please confirm that this message just means that everything is working as expected. xD