LinkedIn is down for many users, including on the web and mobile, and we are not sure why. Accessing LinkedIn from the East Coast shows BLUEDGE0406 in the Reference B field, but users connecting from London, UK, see LON04EDGE0620. BleepingComputer noticed on some attempts an alternate error message is displayed when trying to reach LinkedIn, in what appears to be a DNS-related issue. LinkedIn’s mobile app was not able to connect to the servers either and fails to load the feed.
Source: https://www.bleepingcomputer.com/news/technology/linkedin-is-down-for-many-and-we-are-not-sure-why/