It can be fixed by reinstalling and fully patching the game. Please make sure you wait until the installation and patching process is completed before starting the game - this is essential to prevent the error from occurring again.
If the error persists after reinstalling and fully patching the game, you may find the information in the following articles useful:
Other factors that may affect the quality of your connection
If you are looking for more information on error codes in For Honor, please check our list of error codes.