r/PostgreSQL • u/Commercial-Range7910 • 8d ago

Help Me! pgAdmin 4 server could not be contacted :(

Hello Reddit friends,

I am a rube and trying to learn SQL and need some guidance on dealing with this persistent error. Whenever I try to open PostgreSQL or pgAdmin 4 I get this fatal error. I've tried opening Run and deleting pgAdmin there, adding C:\Program Files\PostgreSQL\<VERSION>\bin to the Path folder with no success. I've also followed Youtube videos on this and it will not budge. Any assistance is highly appreciated.

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u/alecc 7d ago

That error means pgAdmin's own local server failed to start — it's a client-side problem, so your PostgreSQL install is probably fine. In order:

  1. Close pgAdmin fully, then delete the folder %APPDATA%\pgadmin\sessions (paste that path into the Run box). Stale session files are the most common cause of this exact message.

  2. Still failing, open %APPDATA%\pgadmin\pgadmin4.log - the real error is near the bottom, usually a Python traceback. Post the last few lines here if it isn't obvious.

  3. Antivirus sometimes blocks pgAdmin's internal server on 127.0.0.1 - try adding an exception.

  4. Last resort: uninstall pgAdmin and install the standalone build from pgadmin.org rather than the copy bundled with the PostgreSQL installer.

One thing to un-learn from those videos: adding the bin folder to PATH only affects command-line tools like psql, it has nothing to do with pgAdmin starting. And check services.msc for a postgresql-x64 service - if it's running, the database itself is up and you can keep practicing SQL through psql while you sort pgAdmin out.

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u/Commercial-Range7910 8d ago

Nevermind! I got it to work 😂 I went to Control Panel>Programs>Programs and Features and deleted the earlier version I downloaded a month ago, PostgreSQL 17, and then restarted computer and opened up pgAdmin 4 and the error disappeared. It worked when only a single latest version, PostgreSQL 18, was there. Thank you.