Doomsday Engine

I agree that a connection failed/attempting to connect message being displayed on the screen is something that Dday really needs (along with a message when a connection with a server is lost); these messages are currently only logged in the console.

Though, many of the specific server details yourself lists are already there; click on the 'dot's' button to the right of a servers information, to be presented with information about the users engine version (though, not build number, which I believe is a glaring omission considering Dday provides unstable builds in an official capacity). Ping used to also be displayed here, but it turned out to be broken.

Iwad version (or something similar) would be cool to add though, simply because the unofficial/official (i.e the generally stated requirement of all Doom Source Ports) declaration that Dday requires the latest Iwad versions is no longer completely accurate; modern Dday officially supports HeXen 1.0 and 1.1 and doesn't officially support the Doom BFG Edition Iwads, which are the latest Iwad versions for those games.

Dday has also never blocked and can actually run with Iwad versions older than the latest (most of the Iwad changes between versions are simply map tweaks which aren't an issue to Dday, though of course would be an issue in MP with players using different Iwad versions).

As I mentioned in your other issue report regarding MP version mismatch, the old MP Gui did use to check the Cr32 of the hosts Iwad and state if it was different to yours; it would be cool for that to return in some form (albeit, perhaps in a more readable to the typical user)