Example for loading from Postgres doesnt work

[mispp]

I'm trying to run an example from this page to load simple table from postgres into a dataframe, but fails with error below. Any idea what is wrong?

Note:

• happening in windows wsl / ubuntu.
• db connection string is redacted
• would have asked on stackoverflow, but there is no connectorx tag and i dont have enough reputation to create it

    Finished dev [unoptimized + debuginfo] target(s) in 19.23s
     Running `target/debug/insight`
thread 'main' panicked at 'run failed: PostgresError(PostgresPoolError(Error(Some("error connecting to server: Protocol not available (os error 92)"))))', src/main.rs:22:63
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

running following works fine.

psql -h 192.168.48.106 -U user db

Cargo.toml looks like this

[package]
name = "testapp"
version = "0.1.0"
edition = "2021"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
parquet = "40.0.0"
polars = { version = "0.30.0", features = ["lazy","temporal","describe","json","parquet","dtype-datetime","dtype-categorical", "sql", "streaming", "serde-lazy", "ipc", "dynamic_groupby", "sort_multiple", "rows", "dataframe_arithmetic", "partition_by"] }
serde = "1.0.163"
serde_json = "1.0.96"
connectorx = { version = "0.3.1", features = ["src_postgres", "dst_arrow", "dst_arrow2"] }

Overall code looks like this:

use parquet::file::reader::{FileReader, SerializedFileReader};
use std::{fs::File, path::Path};
use polars::prelude::*;
use connectorx::prelude::*;
use std::convert::TryFrom;

fn main() {
    //let _ = _parquet();    
    //let _ = _dataframe();
    //let _ = _dataframe2();
    let _ = _load_from_sql();
}

fn _load_from_sql() -> Result<String, String> {
    let mut source_conn = SourceConn::try_from("postgresql://user:[email protected]:5432/db").expect("parse conn str failed");

    let queries = &[
        CXQuery::from("SELECT * FROM demo_data WHERE id < 100"),
        CXQuery::from("SELECT * FROM demo_data WHERE id >= 900")
    ];

    let destination = get_arrow2(&source_conn, None, queries).expect("run failed");

    let _data = destination.polars();

    println!("{:?}", _data);

    Ok("done".to_string())
}