I'm using Develop Bot, fresh install:
[03:08:01] Info: [============ TS3AudioBot started =============]
[03:08:01] Info: [=== Date/Time: Sunday, November 19, 2017 3:08:01 AM
[03:08:01] Info: [=== Version: 0.8.0-unstable.22/develop/02d7d9d3
[03:08:01] Info: [==============================================]
[03:08:01] Info: [============ Initializing Modules ============]
[03:08:02] Info: [=========== Initializing Factories ===========]
[03:08:02] Info: [================= Finalizing =================]
[03:08:02] Info: Bot connecting...
[03:08:02] Info: Using opus version: libopus 1.1.3 (x64)
[03:08:06] Info: TS3AudioBot shutting down.
[03:08:46] Info: TS3AudioBot shutting down.
Today I found the same problem. The bot cant connect to many servers.
He could do it in the past... e.g. Server from g-portal.com or other big TeamSpeak server hoster...
When I activate the exceptions, I get the following error: (example server ts.g-portal.com)

I hope it helps to fix the problem ...
I've added a debug log to the current dev branch, please try out if this one gives any additional info
I think I see a problem, hmm, I'll post updates when I find out what causes that...
Oh and by the way, the current dev branch is highly unstable and work in progress since i'm working on many multiinstance fixes and implementations
Sorry but the master branch has the same error.
Since when does this happen?
Sorry i don't know
I found a tiny bug and fixed it. Please try the latest dev branch to see if iconnecting works again.
Yes the bot is now connecting... What was the bug?
My TsDnsResolver checked if a port was added with the target address. Accoding to the tsdns standard if yes this port would override the port returned from the srv dns entry. Unfortunately I checked the wrong value and always overwrote the port. So yeah...
Edit: yet another fix, I messed up twice
This is fixed now? Because cant connect the bot, im using the last develop branch.
$ mono TS3AudioBot.exe
[01:44:57] Info: [============ TS3AudioBot started =============]
[01:44:57] Info: [=== Date/Time: Tuesday, December 5, 2017 1:44:57 AM
[01:44:57] Info: [=== Version: 0.8.0-unstable.33/develop/6078a0f5
[01:44:57] Info: [=== Plattform: Ubuntu 16.04 (64bit)
[01:44:57] Info: [==============================================]
[01:44:57] Info: [============ Initializing Modules ============]
[01:44:57] Info: Using opus version: libopus 1.1.3 (x64)
[01:44:57] Info: [==================== Done ====================]
[01:44:57] Info: Bot connecting...
Edit: nvm is working!
Most helpful comment
I think I see a problem, hmm, I'll post updates when I find out what causes that...
Oh and by the way, the current dev branch is highly unstable and work in progress since i'm working on many multiinstance fixes and implementations