Use setting instead of hard-coding port

services/chat/config/settings.defaults.coffee

@@ -6,7 +6,7 @@ module.exports =
 	
 	apis:
 		web:
-			url: "http://#{process.env['WEB_HOST'] || "localhost"}:3000"
+			url: "http://#{process.env['WEB_HOST'] || "localhost"}:#{process.env['WEB_PORT'] or 3000}"
 			user: "sharelatex"
 			pass: "password"