do you mean, you were able to play but eventually your character selection is empty now? Were there any change in PC done (like new firewall, antivirus etc.)? Please check that router/software is not blocking ports 7770, 8089, 5672, 5222, 8080, 21020-21036, 7401-7600 for the game, also turn off all programs which use internet heavily (like torrent programs, netflix clients, K9 kind of software etc.), disable antivirus, firewall any other protection/filtering software, also, you can try to put your router into DMZ mode.
If this won't help please send report through Steam Launch option "Report Connection Test" and post report name here (it will look like NAS-XXXX)