Patch Notes

[FIXED] NBA 2K21 Error Code 727e66ac Issue [NEW]


A few NBA 2k21 players are currently facing error 727e66ac while playing the game. NBA 2k21 error code 727e66ac could trigger through various reasons, most likely network connection related. Unfortunately, 2K games consider NBA 2K21 error 727e66ac as an unidentified error. Read more details below.

What is error 727e66ac on NBA 2k21?

NBA 2K21 error 727e66ac is most likely network connection related problem. However, the game developers 2K games consider it as an unidentified error.

How to Fix NBA 2k21 error code 727e66ac?

Fix 1

Try making another player. Upon making the player skip the prelude and your new player should load right up no issue. You can then quit to the main menu and load your original player up and the NBA 2K21 727e66ac error should be gone.


Fix 2

Check your Network Address Translation (NAT) Type settings

Open NAT Type will have fewer conflicts with other player systems and encounter less connectivity issues.

NAT Type Settings

  1. Navigate to your console’s XMB
  2. Push up on the left control stick
  3. Navigate to the Settings panel and choose Network
  4. Under the View Connection Status
  5. Your NAT Type will be on the bottom of the next screen

Check your Firewall / Router for NAT Type restrictions

If you have a firewall or other network hardware, such as a router, you may need to access them to change your NAT type. Sometimes this configuration change is caused by opening or forwarding other network ports.

Check your Open Network Ports


PlayStation Network uses the following ports for communication with game servers:

  • Port 465 (TCP)
  • Port 983 (TCP)
  • Port 1935 (TCP)
  • 3478 (TCP)
  • 3479 (TCP)
  • 3480 (TCP)
  • Port 3478 (UDP)
  • Port 3479 (UDP)
  • 10070 – 10080 (TCP)

Fix 3

Change your DNS and update it with the following.

  1. Go to Settings
  2. Select Network
  3. Select Set Up Internet Connection
  4. Select Wifi/LAN (depending on what you use to connect)
  5. Select Custom
  6. Select / Enter the following details
  • IP Address Settings = Automatic
  • DHCP Host Name = Do Not Specify
  • DNS Settings = Manual




PRIMARY: (google DNS)

  • MTU Settings: Automatic
  • Proxy Server: Do Not Use

More fixes

Restart your console:

  • Turn off your console and then turn it back on.

Make sure your game software is up to date:

  1. Go to the PlayStation home screen.
  2. Highlight the game you’re playing and press the Options button on your controller.
  3. Select “Check For Update” and install any updates that are available.

Make sure your PS4’s system software has the most recent update:

  1. Select Settings at the top of the PlayStation home screen.
  2. Choose “System Software Update” and allow any system updates to install.
  3. Reboot your PlayStation 4.

An upcoming update will fix NBA 2k21 error 727e66ac issue.