This problem is reported to occur on both PC and Xbox One. Some uses get this error with every server they attempt to connect to while others say the problem only occurs occasionally. As it turns out, there are several different causes that might end contributing to the apparition of the ‘Marblebeard Error Code‘:
Method 1: Checking status of Sea of Thieves servers
Before you start following any other potential fixes, you should start by investigating whether the issue is widespread or it’s only occurring locally (for you). It’s possible that you’re encountering the Sea of Thieves MarbleBeard Error due to a server issue that is preventing you from connecting/reconnecting to a server. In the past, affected users have reported that they ended up seeing this error code whenever the Xbox Live infrastructure is down or Sea of Thieves is having server problems. Before trying any of the other fixes below, start by visiting DownDetector and IsTheServiceDown to see if other users are currently encountering the same problem. If you discover that other users are encountering the same problem, you should check the official Twitter account of SeaofThieves for announcements of the status of the issue. Also, keep in mind that this game is built around the Xbox Live infrastructure, so if that is down, the multiplayer component of Sea of Thieves will stop working. To verify if this is the case, check out the Xbox Live Status page and see if there are currently any problems with the Xbox Live Core Services and if Sea of Thieves is mentioned under Games & Apps. In case you discovered that the problem is indeed caused by a widespread server issue, none of the potential fixes below will fix the ‘Marblebeard Error Code‘ with Sea of Thieves. In this case, you need to wait for the developers to fix the problem. However, if the investigation you just did didn’t reveal any server problems, move down to the next potential fix below.
Method 2: Ensuring that NAT is OPEN
As it turns out, the most common problem that will spawn the Sea of Thieves MarbleBeard Error on both Xbox One and PC is an inconsistency with the Network Address Translation (NAT). This metric is absolutely essential in determining how easy it is for your machine to connect with other players when playing a game. If your NAT is Closed, you can expect to see the Marblebeard Error code every time you want to establish a connection with a game server. However, there is one Universal fix (enabling UPnP) that will allow you to keep your NAT opened. But before we get to that guide, you should check to see the status of your NAT. In the event that your NAT is already Open, enabling UPnP (Universal Plug and Play) will not resolve the issue for you. Depending on your platform of choice, follow one of the two guides below to see if your NAT Type is Open.
A. Checking NAT Type on Xbox One
B. Checking NAT Type on PC
Opening NAT via your Router Settings
In case you’re using a router that’s too old to support UPnP, follow the instructions below to open the forward the ports manually
Method 2: Forwarding the ports manually
In case your router is too old to support the Universal Plug n Play technology, you will need to open the port used by Sea of Thieves manually. Fortunately, since Sea of Thieves is built on the Xbox Live infrastructure, the same port is being used on Xbox One and PC. If you’re using an old router and you are forced to open the Sea of Thieves ports manually, follow the instructions below: In case you still end up seeing the Sea of Thieves MarbleBeard Error, move down to the next potential fix below.
Method 3: Resetting Router
If you previously made sure that the port required for Sea of Thieves to run is opened (either through UPnP or you forwarded the 3074 manually) and the problem is still not resolved, you might be dealing with an IP / TCP networking inconsistency that can be resolved with a simple router reset or restart. Some users that were previously dealing with the same problem have confirmed that the problem has been fixed after they forced a router reboot or reset. Start with a simple router reboot in order to avoid overriding any custom network settings that you have previously established. To do a simple router reboot, press the dedicated power button on the rear or disconnect the power cable from your networking device. After you do this, wait for a full minute before powering on the router once again. Once the network connection is re-established, see if you’re still encountering the same ‘Marblebeard Error Code‘ in Sea of Thieves. In case the error persists, move forward to a router reset procedure. Note: Keep in mind that a router reset procedure will reset any personalized settings that you previously established from your router settings – this includes forwarded ports, custom login credentials, and any security preferences. To perform a router reset, use a sharp object (like a needle or a toothpick) to press and hold the reset button on the back of your router. Keep it pressed until you noticed that all the front LEDs start flashing concurrently, then release the reset button and let your router restart. Once the Internet connection is re-established, restart the platform you use to play the game (Xbox One or PC) to force your router to assign it a new IP and see if the problem is persisting. In case you still end up seeing the ‘Marblebeard Error Code‘ when you attempt to join a multiplayer game, move down to the next potential fix.
Method 4: Clearing MAC Address (Xbox One Only)
In case you are seeing the ‘Marblebeard Error Code‘ on an Xbox One console, you should also attempt to clear the Alternate MAC Address to ensure that you’re not dealing with a network issue that’s preventing your console to communicating with Rare’s servers. Some users that were also dealing with this error code have confirmed that the disconnects have stopped once they cleared the Alternate MAC address from the Network menu of Xbox One. If you’re not sure how to do this, follow the instructions below to clear the alternate MAC address on Xbox One: In case you still end up seeing the ‘Marblebeard Error Code‘ when you attempt to join a multiplayer game in Sea of Thieves, move down to the final potential fix below.
Method 5: Hard Resetting the console (Xbox One Only)
If none of the potential fixes above have worked for you on Xbox One, it’s likely that you’re having these issues due to some type of system corruption that is affecting your console ability to communicate with game servers. In this case, the last resort should be reset every OS file and game-related file to ensure that you have no local components that might cause this problem. Note: This process will ultimately reset your console to the factory state, so it’s recommended that you back up any saved data to the cloud or to a flash USB drive in order to avoid any progress loss. Follow the instructions below to perform a hard reset on your Xbox One console:
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