Postgresql can't connect application server through PGAdmin4

Question

I installed PostgreSql on my Windows machine. I can connect to PostgreSql through cmd. But when I want to launch pgAdmin I am getting this error message.

Answer 1

I ran into this today even though the service was running in Windows 10. I just stopped the service, gave it a few seconds, and restarted it. I was able to connect with pgAdmin 4.