[5.4.3] - Unreal Server not Starting, no Log Files

Got a pretty serious issue… Just upgraded to 5.4.3 (from 5.3.2) and the server.exe isn’t starting. It’s not even generating log files or an output when using the ‘log’ argument. Project loads and works fine in editor. Client build loads and works fine.

Some minor warnings when packaging, but no errors and nothing serious-looking.

I use the source build of the engine, I was thinking of trying to attach it to the process in some way to try and see why it’s stalling? I’m not sure what I need to do

Anyone with previous experience trying to debug this can share some insight? At a brick wall at the moment with nothing to go on. Some detail below of my troubleshooting & actions:

  • Tested in-editor and packaged with 5.3.2 with no issues
  • Upgraded and full regeneration of project files and fresh package & build
  • Using ‘Test’ package configuration and same maps and settings as 5.3.2
  • Odd thing I noticed #1; some of my project C++ files were complaining that the ‘std’ library wasn’t being loaded. Is there any VS settings I need to check? Source Engine built fine with no errors
  • Odd thing I noticed #2; unreal rejected my previous build settings (.cs file), I had compatibility settings since UE4.26. I replaced these with a ‘default’ build file set, no errors or issues when building or loading in editor.