TeamSpeak 3 allows unauthenticated users to connect via Telnet and gives them guest ServerQuery permissions, is this no longer available with TeamSpeak 6?
Server Query can still be accessed with a guest account. Simple Telnet access was disabled though for the lack of transport encryption. You can still use SSH and WebQuery.
How do you access the guest account via SSH or WebQuery?
It seems I was mistaken. There seems to be no way to connect to either anonymously…
Given the TeamSpeak 6 server still carries the Server Query Guest permissions I did not assume they would simply rip out this feature without having an adequate replacement or would at least remove all traces including these permissions. But it seems they made this ideological change yet again without actually thinking about it…
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As @Gamer92000 already mentioned, there does not seem to be any way to access SSH Query or WebQuery anonymously in TeamSpeak 6. That makes me wonder what the remaining Guest ServerQuery permissions are actually used for. If guest Query access was intentionally removed, are those permissions still used somewhere internally, or is some form of restricted, read-only guest access planned for the future? I can understand why this is confusing, since the permissions are still visible and make it look like guest Query access should still be possible.
I just confirmed with the team and like already pointed out it is not possible to access the query without any login credentials due to the nature of an SSH connection.
You would need to create a new login and adjust the permissions accordingly if you want to share access to the query with others.
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Why then are there still permissions for guest query accounts? Having no option for guest queries seems like a monumental loss.
SSH does not require user identification further than a username. Even OpenSSH allows connecting with only a username, given PermitEmptyPasswords yes is set and the account genuinely has no password.
Furthermore, the WebQuery has no such problem, as leaving out the authentication header has no further implications.
So is there an actual reason why no guest sessions are allowed anymore?
Okay, after further consideration and input on your side @Gamer92000. We’re exploring options on bringing guest query login back.
No direct release date yet, however it might be included with the next beta. 
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Thanks! Much appreciated
It’s definitely going to be useful to me and I should assume it’ll be useful to tsviewer.com too as they rely on anon ServerQuery access to view online users
That sounds like a good direction to me. A limited guest query login would be really useful for server viewers, status pages and monitoring tools, especially if it only exposes basic read-only information.
For me, the important part is that admins stay in control. If it is disabled by default and can be configured through permissions, it seems like a good compromise between security and compatibility. Really nice to hear that this might be coming back in one of the next betas. 