We're running a vanilla/test server on "vanilla.cube-nation.de" which is a DNS SRV record pointing to "cube-nation.de:22296" internally.
Using the later one still works fine while using the SRV record stopped working since out update to the pre-release today. The server added to the client is shown as "offline" and connecting to it times out after a while.
So there seems to be some issue/bug here.
Hope you can still fix this for the official release, since that would break a lot of "multi server" concepts.