Well I saw this in the FAQ:
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Q: When I put in a username and password on the login screen for Lego universe it says “Sorry, we could not log you in to Lego Universe right now, try again in a few minutes.”
A: The client displays this message when it cannot reach the server (in which case it displays “Connecting to Authentication” for a few seconds before this message is shown). When you see this error, make sure that the server is running (console window is open), the server has successfully launched (no MYSQL error), the server threads are working (Messages like “World started! Listening on: 2003”), and the client connects to your server (you should see “Server IP: 127.0.0.1”, “Server IP: localhost”, or the external server IP you wish to connect to at the bottom of the login screen).
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But I am having the same issue for public servers (Ion Universe & LUR) and I don’t know what’s causing it. I have a windows 10 PC with an „Intel(R) Core(TM) i3-4010U CPU @ 1.70GHz 1.70 GHz“ and with 4.00 GB of RAM.the following is a copy of my boot.cfg file
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SERVERNAME=0:LUNIServer,PATCHSERVERIP=0:,AUTHSERVERIP=0:ion.luniserver.com,PATCHSERVERPORT=1:2014,LOGGING=1:100,DATACENTERID=5:150,CPCODE=1:89164,AKAMAIDLM=7:0,PATCHSERVERDIR=0:luclient,UGCUSE3DSERVICES=7:1,UGCSERVERIP=0:127.0.0.1,UGCSERVERDIR=0:3dservices,PASSURL=0:https://luniserver.com/wp-login.php,SIGNINURL=0:https://luniserver.com/wp-login.php,SIGNUPURL=0:https://luniserver.com/wp-login.php?action=register,REGISTERURL=0:https://luniserver.com/wp-login.php?action=register,CRASHLOGURL=0:http://127.0.0.1/luni/cls.php,LOCALE=0:en_US,MANIFESTFILE=0:trunk.txt,TRACK_DSK_USAGE=7:1,HD_SPACE_FREE=5:134179,HD_SPACE_USED=5:11396,USE_CATALOG=7:1
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If anyone can help that would be appreciated.

-Roorem10