Reboot–the last resort

Simple, weird problem, long research, short answer.  The other evening, “something strange” happened to one of my clustered (active-active) boxes.  When i arrived in the morning, the linked servers from each of the nodes to the other node was failing with the message: “Unable to complete login process due to delay in login response”. (Microsoft SQL Server, Error: 258)”  Linked servers to and from all other Sql boxes were functioning.  After much research, at the end of the day i had each node rebooted.  Following the reboot process, the linked servers worked again.  Done.