Failed to Open the System Default Web Browser. Is One Installed - Pgadmin4

pgadmin4 not displaying properly

To resolve the issue, use the Windows Registry Editor to reset the value of

HKEY_CLASSES_ROOT.css\Content Type

to

text/css

and then restart pgAdmin4.

Ref: https://www.pgadmin.org/faq/#6

Note: Use Chrome or Firefox latest version with pgAdmin4, IE11 does not support many latest HTML technologies, for example with IE11 you will not able to download the graphical explain plan.

Launching pgAdmin v4 on a browser that is not the default one

As pointed out by a developer of EnterpriseDB (the company behind pgAdmin) in this answer, that is a bug in the QT library that happens on Windows platform; it has already been reported and developers are working on that.

Postgresql can't connect application server through PGAdmin4

The same problem happened to me today:

And this is how I've solved it:

1) Use a text editor to open the config_distro.py file under the c:\Program Files\pgAdmin 4\v1\web folder. Change the value for SERVER_MODE from True to False, then save the change. (I have run Notepad++ as an Administrator, in order to be able to save in this protected folder.)

2) Go to folder c:\Users\your_name\AppData\Roaming\pgAdmin and make sure there is nothing there (delete all the files, as they are temporary and will be restored after starting pgAdmin)

3) Start pgAdmin

4) This time you will see a white box that sits - at least, on my slow laptop - about 20 seconds. (You may briefly see the original error message, but do not worry).

5) Meanwhile, the temporary files - required for running the application - are created.

6) Once the temporary files process is over, the application starts as expected.

pgadmin4 : postgresql application server could not be contacted.

What finally worked was downgrading to pgadminIII-v.1.22:

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