Invalidate Error

[Fray117]

I think there issue it's a bit old on #873, but somehow I met a similar problems when I tried to write an helper (service) in NestJS.

This issue not came after every restart until it hit a certain interval.

My issue related to credentials validation to Microsoft AD which just went success whatever the password with just a correct dn.

AFAIK, other teams working with this AD were using php which only validate once and flush the client and I assumed with hanging connection like this on JS had some problems.

Minimal reproduction

First, I import Client and make an variable to containing the ldapjs client

import { Client, SearchEntry, createClient } from 'ldapjs'

export class LdapService implements OnApplicationBootstrap {
	private auth: Client
}

then I add function that run everytime the NestJS is started (or restart) to initiate the client

async onApplicationBootstrap() {
	const ldapOptions = {
		url: LDAP_URL,
		reconnect: true,
	}

	this.auth = createClient(ldapOptions)

	this.auth.on('connectError', (err) => {
		this.logger.warn(`Auth ${err}`)
	})

	this.auth.on('error', (err) => this.logger.error(`Auth ${err}`))
}

Finally I had an function to verify dn and password by bind

async authenticateLdap(dn, password): Promise <boolean> {
	return new Promise((resolve) => {
		this.auth.bind(dn, password, (err) => {
			if (err) {
				// Bind failed
				resolve(false)
			} else {
				// Bind was successful, immediately unbind for next user authentication
				this.auth.unbind()

				resolve(true)
			}
		})
	})
}

I tried to unbind immediately after it succesfully binded

However in about several minutes later it came an error Client Error: read ECONNRESET which returned by this listener

this.auth.on('error', (err) => this.logger.error(`Auth ${err}`))

Originally posted by @Fray117 in #873 (comment)