Maintenance for the week of January 6:
• PC/Mac: No maintenance – January 6
• NA megaservers for maintenance – January 8, 4:00AM EST (9:00 UTC) - 8:00AM EST (13:00 UTC)
• EU megaservers for maintenance – January 8, 9:00 UTC (4:00AM EST) - 13:00 UTC (8:00AM EST)
The game's working fine for me, I logged in just a few minutes ago to check something, with no problems. The OP's problem was most likely Norton: it's the most user-unfriendly security software ever. I used to use it, but then uninstalled it, because it was causing more problems than the malware it was supposed to prevent.
PC(Steam) / EU / play from Melbourne, Australia / avg ping 390