Neon•3mo ago

Neon Local Connect Issue: Password Authentication Failed

Hello! I've got Neon Local Connect Extension set up through Cursor, and I am running the Docker container through Docker Desktop on Windows. Even though the container is running and the extension window shows that it is connected to the correct branch, I do not see anything populated in the schema visualizer. Moreover, when I attempt to check the connection through powershell I get the following error: psql: error: connection to server at "localhost" (::1), port 5432 failed: FATAL: password authentication failed for user "neon"

I have tried a few different methods of the command as you can see in the screenshot, with and without ssl, but the error remains the same each time.

standard-azureOP•9/25/25, 6:24 PM

Interestingly the connection seems to work if I execute the command from a terminal within docker desktop

standard-azureOP•9/25/25, 6:45 PM

confirmed this is just an issue running in windows, running cursor and all commands through WSL works fine

comprehensive-tomato•9/25/25, 7:04 PM

@Foxblush thanks for following up - is it something specific to running Neon Local Connect in Windows? Should we add a note to docs?

standard-azureOP•9/25/25, 7:11 PM

it seems to be, haven't yet figured out what might be the underlying issue when running NLC in windows, but I definitely know it wasn't just a Cursor issue. any powershell I tried to execute a psql connect would fail with the same issue. when I saw the Docker terminal worked, I tried it in a WSL terminal outside docker, which worked as well. so I loaded up Cursor in WSL and found that it worked fine. even did a drizzle-kit push with it. and schema visualization is working in the extension window.

dead-brown•11/4/25, 7:27 PM

@Foxblush @andyhats FWIW, I've just come across the same issue trying to connect on MacOS. running the container directly via docker-compose seems to get me farther than via the Cursor/VScode extension.

comprehensive-tomato•11/4/25, 7:39 PM

ok thanks for flagging I'll try and replicate - so running just via extension broke for you?

dead-brown•12/2/25, 3:40 PM

Surfacing this discussion. I'm experiencing the same issue from my MacOS. Running Orbstack + Cursor extension. Error is

connection failed: connection to server at "127.0.0.1", port 5432 failed: FATAL: password authentication failed for user "neon"

connection failed: connection to server at "127.0.0.1", port 5432 failed: FATAL: password authentication failed for user "neon"

. Extension indicates Connected to branchConnected to branch but doesn't let me view the schema (most likely due to conenction failure).

instant-harlequin•12/3/25, 3:10 AM

Does the connection to work if you execute the command from a terminal within the container? psql "postgres://neon:npg@localhost:5432/neondb"psql "postgres://neon:npg@localhost:5432/neondb"

dead-brown•12/4/25, 2:26 PM

yes it works @Sam

Ddead-brown yes it works <@1293597956108194005>

instant-harlequin•12/4/25, 2:57 PM

What OS are you running? If it's windows, I'm guessing you get an error when you run it from the windows shell?

dead-brown•12/4/25, 2:58 PM

nope im running on macos. tried connecting from neon-serverless in a nodejs environment & pgadmin. gave the same connection error

instant-harlequin•12/4/25, 2:59 PM

And have you tried manually restarting the container?

dead-brown•12/4/25, 8:42 PM

I restarted it by disconnecting & reconnecting the neon local. Is there a different way to restart the container?

Ddead-brown I restarted it by disconnecting & reconnecting the neon local. Is there a differ...

instant-harlequin•12/5/25, 6:03 PM

Try running it directly through docker compose rather than the extension, and let me know if this works

dead-brown•12/6/25, 10:02 PM

@Sam Resolved. I have open sourced PostgreSQL installed on my device so it was using the same port 5432 which created this issue. Appreciate your support!

dead-brown•12/6/25, 10:03 PM

I think there should be a feature to throw an error if port is already in use.

instant-harlequin•12/6/25, 10:45 PM

Glad you got it sorted! But yeah you're definitly right, that's something it should check and error out on. Thanks for updating!

Neon Local Connect Issue: Password Authentication Failed

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