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HBO Error Code 321: Here’s How To Fix The Problem

HBO Error Code 321: Here’s How To Fix The Problem

You can usually always rely on HBO to provide a fluent consent video service, but from time to time, you may experience the HBO error code 321.

Commonly caused by a service outage, or an unstable server, error code 321 will display the message, “oops something has gone wrong” across your screen to let you know a problem has occurred.

With a number of reasons that can cause the 321 error code, we decided to construct a guide to help understand why the error is displaying on your device and give you some quick fixes so you can sit back and enjoy your HBO max video-on-demand service. 

Why do I keep getting error code 321 on HBO Max?

couple trying to watch HBO max

If the HBO Error Code 321 is presenting itself on your screen, this is due to generic issues that can transpire while using an application.

Issue 1. HBO server issue

The HBO Max server may be experiencing an outage, or it has been purposefully put on downtime for planned maintenance.

You can check here to see if HBO currently has an outage on their server. If this is confirmed, you will need to wait for HBO to fix this problem on their side.

Issue 2. A poor internet connection

If your network is experiencing a sporadic internet connection, or the bandwidth speeds are not adequate enough for HBO max to stream, you will receive the error code 321.

Issue 3. Corrupted software files

The software files from your HBO Max application could be corrupted. Contaminated files will hinder HBO’s performance, and stop it from being able to work properly.

Issue 4. Outdated app version

If you haven’t updated your Home Box Office to its latest version, this will cause the service to become problematic.

Apps are always being upgraded to improve performance and stay compatible with devices’ operating systems.

Issue 5. Conflicting browser settings

If you are accessing HBO Max through your browser, you may have conflicting settings that are interfering with the app’s ability to load successfully.

Browser extensions and VPNs can become problematic when using your Home Box Office.

How do I fix HBO Max error code 321?

woman watching tv

Fix 1. Clear HBO cache files

Are you wondering, ‘How do I clear HBO Max cache’, this is a simple fix, and will help get rid of your HBO app showing you the error 321 on your screen.

On Android:

Step 1. Go into ‘Settings’

Step 2. Find ‘Apps and Notifications’

Step 3. Select HBO Max

Step 4. Click on ‘Storage’ followed by ‘Clear Storage’

Step 5. Choose ‘Clear Cache’

Once this has been completed, relaunch HBO.

Note, if you are accessing HBO on an Apple device, you will need to delete HBO and reinstall it to remove the cache files that have been built up.

Fix 2. Check internet connection

The internet connection that HBO Max is connected to, could be too slow, or just not stable enough.

You need at least 5Mbps to be able to stream on HBO. Making sure your wifi speeds are okay is important, and can be checked here.

If you are experiencing screen issues on HBO, you can click here for added support.

Resetting your wifi router will aid in getting rid of the HBO error code 321;

Step 1. Disable your router

Step 2. Undo the plug

Step 3. Create a minute gap before plugging the router back in

Step 4. Turn your router on

Once your device has reconnected, try accessing HBO’s library.

Fix 3. Update app

Always ensure you are using the latest version of your HBO Max streaming service app to be able to enjoy all their original movies from AT&T

Service apps are purposefully always being updated to improve their performance when you access their content.

Step 1. Go into your app store

Step 2. Search for HBO 

Step 3. Select ‘Update’ if there is an option to

Once the app has been downloaded and overridden the current version, restart your device and log back in.

Tip, make sure the operating system of your device is on the latest version too, as this will ensure the app will stay compatible with your device.

Fix 4. Change browser settings

There could be a browser extension that is interfering with HBO working if you are launching it through your web page.

Step 1. Go onto your home web page

Step 2. Select ‘Settings’

Step 3. Click on ‘Extensions’

Step 4. Turn all the extensions off

Restart your computer and load HBO again.

Turning your VPN off may also eradicate the HBO error code 321 from your display;

Step 1. Go into ‘Settings’

Step 2. Click on ‘Network and Internet’

Step 3. Select ‘VPN’ and toggle the options to off

Relaunch HBO once this has been done.

man experiencing hbo issues


Now error code 321 has been fixed, you can proceed with enjoying the great content that HBO Max has to offer, without having to see ‘oops something went wrong’ on your TV screen.

One of the leading causes of the 321 error is a service outage which should resolve itself without any need for you to do anything.

If the HBO max 321 error code is still causing you problems you can contact HBO customer services here, or you can make use of their Twitter page.


  • Michael Stokes

    Over 10 years of experience working as a technical support engineer. Highly skilled in fixing any technical issue, including app configuration and account setup, gaming errors, television problems, and any other electronics-related issue. You can find out more about him at