Untrusted Certificate upon open Studio Pro

Hi community,   This message <Bad Server Certificate mng.mtsalpha.1.dev2a.avelio.jp> pop out when I open the Studio Pro. I haven’t try to run the App, it just pop out without me doing anything today. I’m not sure if I should accept this or not, why does this happened, and why now of all times? The only thing that connected to this App is PostgreSQL database and I never encountered this situation before.  
1 answers

I also did get this message by opening a project in de Mendix Studio Pro.

Shutdown Studio pro via Task manager, restart the project and there was no warning anymore.