Sony offers solution for NW-31194-8 error on PSN
UPDATE 2/1/15: Many users are again reporting issues logging into PSN. Per Sony:
“We’re aware that some users are experiencing issues signing into PSN – engineers are investigating. We’ll keep you posted.”
UPDATE 12/29: For those who can’t get online still, particularly in Europe and Asia, here is a temporary fix involving the changing of the PS4’s MTU settings.
UPDATE 12/28: PSN appears to be back online on both consoles.
Many PlayStation Network users have been reporting problems signing into their PlayStation 4s after the 2.0 firmware update, (UPDATED 12/25: as well as the Christmas Day hack), with an NW-31194-8 error code.
Fortunately, while there isn’t an official fix for the problem, Sony has added a temporary solution for the error to their Error Codes page.
To fix the issue, Sony suggests the following steps:
Step 1: PSN or the game’s server may be temporarily unavailable. Please check the status of the game’s server via its website. You can check the status of the PSN here.
Step 2: If the servers are active, run the Internet connection test at [Settings] > [Network] > [Test Internet Connection] and make sure you can connect to the network.
Step 3:Update your router to the latest firmware. Turn off other devices that are connected to your network to reduce stress. If this does not work, try again later as the server may be experiencing high volume.
Hopefully that’ll solve the issue for the time being until it’s completely resolved.
Let us know if that’s working for you guys.
UPDATE (12/27 10:26 a.m. PT): According to Sony, the network issues are still being looked into though some users are getting functionality back on both the PS3 and PS4.
Sony has commented on the issue today via Twitter:
We’re aware that some users are experiencing sign-in issues on PS4 and PS3; engineers are investigating the cause.
— Ask PlayStation (@AskPlayStation) December 27, 2014