Maintenance for the week of December 22:
• NA megaservers for maintenance – December 22, 4:00AM EST (9:00 UTC) - 8:00AM EST (13:00 UTC)
• EU megaservers for maintenance – December 22, 4:00AM EST (9:00 UTC) - 8:00AM EST (13:00 UTC)
Since it seems to be me, what can I do about it and why can I play on EU just fine?
My guess? Some ISP in the chain between you and the NA server is blocking you. That ISP is not blocking you, or is not in the chain, between you and the EU server. Perhaps some DDoS mitigation. There is apparently a DDoS going against some US corporates right now according to the news. Not ZOS.