pgadmin4 : postgresql application server could not be contacted.

Question

I have installed PostgreSQL 9.6.2 on my Windows 8.1. But the pgadmin4 is not able to contact the local server. I have tried several solutions suggested here in stackoverflow

Answer 1

I use the cmd prompt on Windows 10 with psql postgres postgres.

Then I launch pgAdmin4 and it works.

Answer 2

Kill it in Windows Task Manager and then try again. It seems that there is some sort of a problem when accessing the server from different applications.

Answer 3

I had same issue on windows. I had v1.6 installed as well as v2.0. Uninstalling v1.6 allowed me to login.

Answer 4

I had this problem with pgadmin4 v2.1 on linux fedora 27

Solved by installing a missing dependency: python3-flask-babelex

Answer 5

It worked for me after installing python2.7 for pgAdmin 4 v2

Answer 6

In Windows Just go to this path and clear it ,that works !!

C:\Users\%USERNAME%\AppData\Roaming\pgAdmin