DOCSP-48389 Connection Troubleshooting Revisions (mongodb#1068)

* DOCSP-48389 Connection Troubleshooting Revisions

* tech question

* edits

* tech review

* edit

* remov

* technical review

* security comment

* JS review

* edit

Author: lindseymoore

source/connect/connection-troubleshooting.txt

@@ -27,36 +27,20 @@ using the {+driver-long+} to connect to a MongoDB deployment.
    with MongoDB or the driver, visit the following resources:
 
    - The :ref:`Issues & Help <node-issues-help>` page, which has
-     information about reporting bugs, contributing to the driver, and 
-     finding more resources
+     information about how to report bugs, contribute to the driver, and 
+     find more resources
    - The `MongoDB Community Forums <https://community.mongodb.com>`__ for
      questions, discussions, or general technical support
 
 Connection Error
 ----------------
 
-The following error message indicates that the driver cannot connect to a server
-on the specified hostname or port. Multiple situations can generate this error
-message. In this sample error message, the hostname is ``127.0.0.1`` and the
-port is ``27017``:
-
-.. code-block:: none
-   :copyable: false
-
-   Error: couldn't connect to server 127.0.0.1:27017
+If the driver cannot connect to the specified host, you might get an 
+``MongoServerSelectionError``.
 
 The following sections describe actions you can take to potentially resolve the
 issue.
 
-.. _node-troubleshooting-connection-string-port:
-
-Check Your Connection String
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-Verify that the hostname and port number in the connection string are both
-accurate. The default port value for a MongoDB instance is
-``27017``, but you can configure MongoDB to communicate on another port.
-
 .. _node-troubleshooting-connection-firewall:
 
 Configure Your Firewall
@@ -65,18 +49,28 @@ Configure Your Firewall
 Verify that the ports your MongoDB deployment listens on are not blocked by a
 firewall on the same network. MongoDB uses port ``27017`` by default. To learn
 more about the default ports MongoDB uses and how to change them, see
-:manual:`Default MongoDB Port </reference/default-mongodb-port/>`.
+:manual:`Default MongoDB Port </reference/default-mongodb-port/>` in the 
+{+mdb-server+} manual.
 
 .. warning::
 
    Do not open a port in your firewall unless you are sure it's the port
    used by your MongoDB deployment.
 
+Check Your Network Access List
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+Verify that your IP Address is listed in the IP Access List for your cluster.
+You can find your IP Access List in the Network Access section of 
+the Atlas UI. To learn more about how to configure your IP Access List, 
+see the :atlas:`Configure IP Access List Entries </security/ip-access-list/>` 
+guide in the Atlas documentation. 
+
 ECONNREFUSED Error
 ------------------
 
 If the connection is refused when the driver attempts to connect to the MongoDB
-instance, it generates this error message:
+instance, it generates an error message similar to the following:
 
 .. code-block:: none
    :copyable: false
@@ -86,8 +80,8 @@ instance, it generates this error message:
 The following sections describe actions you can take to potentially resolve the
 issue.
 
-Ensure MongoDB and Your Client Use the Same Protocol
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+Ensure MongoDB and Your Client Use the Same IP Address
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 In Node.js v17 and later, the DNS resolver uses ``IPv6`` by default when both
 the client and host support both. For example, if MongoDB uses IPv4 and your
@@ -113,7 +107,7 @@ ECONNRESET Error
 ----------------
 
 If the connection is reset when the driver calls ``client.connect()``, it
-generates this error message:
+generates an error message similar to the following:
 
 .. code-block:: none
    :copyable: false
@@ -134,7 +128,9 @@ if the number of connections exceeds this limit.
 You can set the maximum number of connections by setting ``maxPoolSize``. To
 resolve this error, you can decrease the number of maximum allowed connections
 by setting the value of ``maxPoolSize``. Alternatively, you could increase the
-file descriptor limit in your operating system.
+file descriptor limit in your operating system. To learn more about how to set
+``maxPoolSize``, see the API documentation for 
+`maxPoolSize <{+api+}/interfaces/MongoClientOptions.html#maxPoolSize>`__ .
 
 .. warning::
 
@@ -151,8 +147,7 @@ error message similar to one of the following messages:
 .. code-block:: none
    :copyable: false
 
-   Command failed with error 18 (AuthenticationFailed): 'Authentication
-   failed.' on server <hostname>:<port>.
+   MongoServerError: bad auth : authentication failed
 
 .. code-block:: none
    :copyable: false
@@ -170,12 +165,13 @@ Check Your Connection String
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 An invalid connection string is the most common cause of authentication
-issues when attempting to connect to MongoDB using ``SCRAM-SHA-256``.
+issues when you attempt to connect to MongoDB by using ``SCRAM-SHA-256``.
 
 .. tip::
 
    For more information about connection strings,
-   see :ref:`Connection URI <node-connection-uri>` in the Connection Guide.
+   see the :ref:`Connection URI <node-connection-uri>` section in the Connection 
+   Guide.
 
 If your connection string contains a username and password, ensure that they
 are in the correct format. If the username or password includes any of the
@@ -217,10 +213,6 @@ database:
    const uri = "mongodb://<db_username>:<db_password>@<hostname>:<port>/?authSource=users";
    const client = new MongoClient(uri);
 
-You can check if this is the issue by attempting to connect to a MongoDB
-instance hosted on the local machine with the same code. A deployment on
-the same machine doesn't require any authorization to connect.
-
 Error Sending Message
 ---------------------
 
@@ -272,27 +264,6 @@ For more information about how connection pooling works, see the
 :ref:`Connection Pool Overview <node-faq-connection-pool>`
 in the Connection Pools page.
 
-Too Many Open Connections
--------------------------
-
-The driver creates the following error message when it attempts to open a
-connection, but it's reached the maximum number of connections:
-
-.. code-block:: none
-   :copyable: false
-
-   connection refused because too many open connections
-
-The following section describes a method that may help resolve the issue.
-
-Check the Number of Connections
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-To create more open connections, increase the value of ``maxPoolSize``. For more
-information about checking the number of connections, see
-:ref:`Check the Number of Connections <node-troubleshooting-connection-number-connections>`
-in the Error Sending Message section.
-
 Timeout Error
 -------------
 
@@ -314,7 +285,7 @@ Set connectTimeoutMS
 The driver may hang when it's unable to establish a connection because it
 takes too long attempting to reach unreachable replica set nodes. You can limit the
 time the driver spends attempting to establish the connection by using the
-``connectTimeMS`` setting. To learn more about this setting, see the
+``connectTimeoutMS`` setting. To learn more about this setting, see the
 :manual:`Timeout Options </reference/connection-string/#timeout-options>` in
 the Server manual.
 
@@ -332,14 +303,6 @@ The following example sets ``connectTimeoutMS`` to 10000 milliseconds.
      connectTimeoutMS: 10000,
    });
 
-Check the Number of Connections
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-
-The number of connections to the server may exceed ``maxPoolSize``. For more
-information about checking the number of connections, see
-:ref:`Check the Number of Connections <node-troubleshooting-connection-number-connections>`
-in the Error Sending Message section.
-
 Client Disconnect While Running Operation
 -----------------------------------------