343 Industries has said it's "investigating" reported issues with Halo 4's multiplayer servers.
Players have hit the official forums to report server outages and glitches with score recognition and post-match reward accreditation.
"The Halo 4 server is not available at this time. Please try again later," is one warning players are reporting, but the issues being encountered are varied.
Acknowledging the reports, a 343i rep has said the developer is "investigating".
"We hear you and apologize for the inconvenience," said the rep on the official forum. "The team is currently investigating the issue and this thread will provide updates as we work on a fix. Stay tuned and thanks for your patience," they added (thanks Joystiq)
Halo 4 released in US and UK today to critical acclaim. Check out CVG's Halo 4 review if you haven't already.