Merge pull request #5741 from addielaruee/fix/stream-ipv6-forward-host-brackets

fix(stream): bracket IPv6 forward host for valid nginx upstream

backend/internal/nginx.js

@@ -1,4 +1,5 @@
 import fs from "node:fs";
+import net from "node:net";
 import { dirname } from "node:path";
 import { fileURLToPath } from "node:url";
 import _ from "lodash";
@@ -226,6 +227,14 @@ const internalNginx = {
 				host.forward_scheme = "$scheme";
 			}
 
+			// A stream forwarding to an IPv6 literal must have the address wrapped in
+			// square brackets before nginx appends ":<port>". Without the brackets nginx
+			// reads the trailing ":<port>" as part of the address and rejects the upstream
+			// ("invalid port in upstream"), so the stream saves but never activates (#5740).
+			if (nice_host_type === "stream" && net.isIPv6(host.forwarding_host)) {
+				host.forwarding_host = `[${host.forwarding_host}]`;
+			}
+
 			if (host.locations) {
 				//logger.info ('host.locations = ' + JSON.stringify(host.locations, null, 2));
 				origLocations = [].concat(host.locations);