How to Fix the pgAdmin 4 v3.0+ Port Number

Your specific problem might have already been resolved, but...

It is possible to configure a fixed port for pgAdmin 4:

1. Click on the pgAdmin 4 tray-icon
2. Click "Configure..."
3. Check the box labeled "Fixed Port Number?"
4. Enter the desired port number in the field next to it

Screenshots:

• pgAdmin 4 Configuration
• Tray icon (on GNOME desktop)

Ran into this problem on Windows Server 2016 with pgAdmin4 v3.5 - resolved it by setting "IE Enhanced Security Configuration" to OFF - can then immediately access the management pages (note - 'run as Administrator' was not required).

Had the same issue in the following setup: Kubuntu 18, Firefox 64.0

What worked for me:

1. Context menu > Copy server URL. That will give us an url of form:
   http://127.0.0.1:1234/?key=18ef03ff-d16a-43bc-af30-b20c66fbf452

2. Navigate to that URL via browser (in my case Firefox worked well)

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The following did not help:

• Context menu > New pgAdmin 4 window...

• Uninstall & install pgAdmin 4

• Clear cookies for 127.0.0.1

• Restart pgAdmin4

Hope this helps someone.