PgAdmin fatal error. The appllication server could not be contacted

Question

A couple of days before I have installed on my PC with Windows 7 Professional new version of PgAdmin (version 4). It worked fine, but today it loads slowly and then information window appears with text: "PgAdmin fatal error. The appllication server could not be contacted.". I restarted windows, but it doesn't help. Is there any solution of this problem? Thanks.

The same thing happened to me using pgAdmin 4 (2.7.13). I had to reinstall it before it worked again. — Steve, Oct 09 '17 at 14:57
Hurrah! Solvation is to odify config_local.py file in web folder, adding SERVER_MODE = False. — Dionisius1976, Oct 10 '17 at 20:49
https://stackoverflow.com/questions/40083391/postgresql-cant-connect-application-server-through-pgadmin4 For more info. — Dionisius1976, Oct 11 '17 at 19:42

score 7 · Answer 1 · answered Nov 15 '17 at 09:58

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I had the same issue. Try right clicking the PgAdmin icon and clicking "Run as administrator". Worked for me.

answered Nov 15 '17 at 09:58

Ray Jowa

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score 6 · Answer 2 · edited Mar 08 '18 at 14:44

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worked for me if I run PgAdmin as administrator.

Right click on the .exe file and run as administrator. It will work.

edited Mar 08 '18 at 14:44

Stephen Kennedy

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answered Mar 08 '18 at 14:19

sudhanshu kumar sinha

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What does this add to the answer from last year saying the same thing? – Stephen Kennedy Mar 08 '18 at 14:43

score 3 · Answer 3 · edited Mar 08 '18 at 14:43

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I tried all options mentioned in link Postgresql can't connect application server through PGAdmin4 .

But none of the options worked, then launching C:\Program Files (x86)\pgAdmin 4\v2\runtime\pgAdmin4.exe from command prompt worked fine.

edited Mar 08 '18 at 14:43

Stephen Kennedy

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answered Jan 25 '18 at 22:32

Deepak

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score 3 · Answer 4 · answered Apr 23 '19 at 14:23

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i got this error using PgAdmin 4 (v4.3) and here is what fixed it for me

right lick on my server and disconnect server
reconnect by clicking expand arrow on the server.

seems my connection was stale

answered Apr 23 '19 at 14:23

Sonic Soul

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This also helped fix "Software caused connection abort" [from your other (deleted) answer to the question](https://stackoverflow.com/questions/43802310/postgresql-could-not-receive-data-from-server-software-caused-connection-abort) – Nate Anderson Aug 28 '20 at 03:41

score 2 · Answer 5 · edited Apr 24 '21 at 19:39

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in C:\Users(your username)\AppData\Roaming delete folder pgAdmin (AppData - is hidden folder)
run pgadmin with administrator.

Worked Fine for me Previously it was showing Fatal error

edited Apr 24 '21 at 19:39

SayedMaheen

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answered Mar 08 '19 at 12:34

Irakli dd

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score 1 · Answer 6 · answered Jun 05 '18 at 18:38

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I had to reinstall it, as Steve suggested in comments. Then it started working again.

It's probably best to start with Ray Jowa's solution -- try right clicking the PgAdmin icon and clicking "Run as administrator".

answered Jun 05 '18 at 18:38

NessBird

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score 1 · Answer 7 · answered Sep 07 '18 at 07:18

This was odd, my PATH variable which had the python interpreter in it was somehow a factor, I do not completely understand though, right after I removed it everything worked, I will look further into it but so far I think that if you have python interpreter it might be the one causing the issue.

score 0 · Answer 8 · answered Jul 14 '22 at 19:23

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rename your C:\Users<your username>\AppData\Roaming\pgAdmin to .back and restart pgAdmin v4.6x

answered Jul 14 '22 at 19:23

Keith Klingeman

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PgAdmin fatal error. The appllication server could not be contacted

8 Answers8