My memory serves me right, a few days back it was showing "localhost". I'm puzzled as to what altered server.address().address to now return double colons (::). According to my research, it seems to be returning an IPv6 address (::) because it's enabled, although it's actually disabled on my computer. For more information, you can visit: https://nodejs.org/api/http.html#http_server_listen_port_hostname_backlog_callback
According to the documentation,
The server will start accepting connections on the specified port and hostname. If no hostname is provided, it will accept connections on any available IPv6 address (::) when IPv6 is available, or any IPv4 address (0.0.0.0) otherwise. Setting the port value to zero will result in a random port assignment.
Therefore, the code below would display running at http://:::3456:
var express = require('express');
var app = express();
var server = app.listen(3456, function () {
var host = server.address().address;
var port = server.address().port;
console.log('running at http://' + host + ':' + port)
});
However, if you include a specific hostname:
var server = app.listen(3456, "127.0.0.1", function () {
The output would be as follows: running at http://127.0.0.1:3456
Additionally, using an IP library as suggested in this post may be beneficial.
It appears that the selection of an IPV6 address is likely due to another application utilizing port 3456 for IPV4 communication. This situation can occur following automatic software updates, which may introduce new processes.
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