Error "Server is unavailable" with Node >= 17

[jer-sen]

Node >= 17 use IPv6 by default, not compatible with MongoDB by default.
This patch can be used to use IPv4:

diff --git a/node_modules/mongodb-topology-manager/lib/utils.js b/node_modules/mongodb-topology-manager/lib/utils.js
index c16f717..1acbbfd 100644
--- a/node_modules/mongodb-topology-manager/lib/utils.js
+++ b/node_modules/mongodb-topology-manager/lib/utils.js
@@ -27,6 +27,10 @@ function cleanupSocket(socket) {
  * @param {function} callback
  */
 function checkAvailable(host, port, callback) {
+  // Use IPv4 since MongoDB does not currently support automatically IPv6
+  require('node:dns').lookup(host, { family: 4 }, (err, ipv4) => {
+    if (err) console.error(err);
+    //console.log(`IPv4: ${ipv4}`);
   const socket = new net.Socket();
 
   socket.on('connect', () => {
@@ -43,7 +47,8 @@ function checkAvailable(host, port, callback) {
     callback(null, false);
   });
 
-  socket.connect({ port: port, host: host });
+  socket.connect({ port: port, host: ipv4 });
+  });
 }
 
 /**

[jer-sen]

Or just add a command line option to bind servers to IPv6 addresses in index.js:

const options = {
         port: port,
         dbpath: isWin ? `${dbPath}\\${port}` : `${dbPath}/${port}`,
-        bind_ip: hostname
+        bind_ip: hostname,
+        ipv6: null,
       };